subject:(Nickel Based Superalloys)

1. Thébaud, Louis. Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™.

Degree: Docteur es, Mécanique des solides, des matériaux, des structures et des surfaces, 2017, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2017ESMA0033

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Compte tenu de l’évolution des températures d’entrée de turbines, le principal enjeu pour les métallurgistes est d’élaborer des alliages capables de présenter d’excellentes propriétés mécaniques… (more)

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Compte tenu de l’évolution des températures d’entrée de turbines, le principal enjeu pour les métallurgistes est d’élaborer des alliages capables de présenter d’excellentes propriétés mécaniques à des températures de plus en plus élevées. Dans ce contexte, connaitre les relations entre les différents paramètres microstructuraux et les propriétés mécaniques à haute température (700°C et plus) est capital.La durabilité en fluage et en fatigue-temps de maintien ainsi que les processus d’endommagement de l’alliage AD730™, un nouveau superalliage pour disques de turbines, ont été analysés. Plusieurs paramètres ont été étudiés, qu’ils soient microstructuraux (joints de grains, taille de grains, taille et distribution des précités γ′), ou expérimentaux (température, environnement, contrainte appliquée, temps de maintien). L’utilisation de monograins de composition chimique identique à l’alliage de l’étude a permis de mettre en évidence le fait qu’une microstructure monogranulaire ne présente pas nécessairement de meilleures propriétés en fluage qu’une microstructure polycristalline. Ceci est attribué au rôle durcissant des joints de grains. Il a de plus été montré qu’à 700°C, la taille et la distribution des précipités γ′ est le paramètre microstructural pilotant les propriétés viscoplastiques à l’ordre 1.En fatigue avec temps de maintien, un comportement original a été observé pour les longs temps de maintien en fonction de la contrainte appliquée. Ce phénomène est attribué à un effet « type Bauschinger » apparaissant lors des phases de décharges.

In view of the turbine entry temperature evolution, the main challenge for metallurgists is to elaborate new alloys able to withstand higher temperatures while keeping great mechanical properties. Therefore, knowing the relationships between microstructural parameters and mechanical properties at high temperatures (700°C and more) is mandatory.The creep and dwell-fatigue durability as well as the damage mechanisms of AD730™, a new nickel base superalloy developed for turbine disks, have been analyzed. Several microstructural parameters were studied (grain boundaries, grain size, size and distribution of γ′ precipitates) as well as experimental parameters (temperature, environment, applied stress or dwell period). By using single crystalline specimens having the same chemical composition of the studied alloy, it has been shown unambiguously that single crystalline microstructures do not necessarily present better creep properties compared to polycristalline ones. This result is supposed to be caused by a grain boundary strengthening mechanism. Moreover, in creep at 700°C, it has been shown that the main viscoplasticity controlling parameters are the size and distribution of γ′ precipitates.An unexpected dwell-fatigue behavior has been observed for long hold times and in a specific applied stress window. This phenomena is attributed to a “Bauschinger type” effect, occurring during unloading phases.

Advisors/Committee Members: Villechaise, Patrick (thesis director), Cormier, Jonathan (thesis director).

Subjects/Keywords: Superalliage base nickel; Ni-based superalloys

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APA (6^th Edition):

Thébaud, L. (2017). Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2017ESMA0033

Chicago Manual of Style (16^th Edition):

Thébaud, Louis. “Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™.” 2017. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed March 09, 2021. http://www.theses.fr/2017ESMA0033.

MLA Handbook (7^th Edition):

Thébaud, Louis. “Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™.” 2017. Web. 09 Mar 2021.

Vancouver:

Thébaud L. Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2017. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2017ESMA0033.

Council of Science Editors:

Thébaud L. Etude des relations entre microstructure et propriétés mécaniques du nouveau superalliage base nickel AD730™ : Relationships Between Microstructural Parameters and Mechanical Properties of a new Nickel Based Superalloy AD730™. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2017. Available from: http://www.theses.fr/2017ESMA0033

University of Sheffield

2. Hanna, Muayyad Dawood. The formation of platinum aluminide coatings on IN-738 and their oxidation resistance.

Degree: PhD, 1982, University of Sheffield

URL: http://etheses.whiterose.ac.uk/2946/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280551

► Platinum alumnide coatings have been produced by first plating a thin layer of platinum usinq a fused salt platinum plating technique and then pack aluminizing… (more)

▼ Platinum alumnide coatings have been produced by first plating a thin layer of platinum usinq a fused salt platinum plating technique and then pack aluminizing using powder packs containingAl, NH4 C1 and Al 2 0 3 or Ni 2A1 3 , NH4 C1 and Al 203 . The chemistry and morphology of these coatings on IN-738 superalloy both in the ascoated and in the subsequently heat treated condition have been studied. The coating morphology and chemistry are highly dependent upon the thickness of the platinum layer, pack activity and time of processing. A relatively thick platinum layer (l0 pm) produced a coating with an outer Pt2A13 layer above other narrow layers. The Pt concentration decreases towards zero as the diffusion zone is approached. A second type, usually formed with a thin (5 pm) Pt layer is characterised by a marked interaction with the substrate. An outer Pt/U 2 layer is followed by a layer of NiAl containing fine precipitates of a chromiumtungsten rich phase. A lamella-like layer hiqh in chromium and other refractory elements exists at the coating/substrate interface in most of the as-coated samples. A third type of coating has been produced by a post-platinising heat treatment process prior to aluminizing. This type of coating is characterised by an outer duplex layer of PtAl 2 and Ni/U. Heat treatment of the as-formed coating results in interdiffusion between Al , Ni and Pt to produce an overall thickening of the coating layer and a decrease in the coating Al concentration. Thus a (Pt,Ni) Al or (Ni,Pt) Al outer layer may develop after heat treating these types of coatings at 1000°C for up to 1200 hours. In addition to this Widmanstatten sigma phase plates extending into the substrate are normally found beneath the outer layer after several hours' of heat treatment. Diffusion paths on pseudo-ternary phase diagrams are made to represent the phase constitution of the as-formed coatings. Isothermal oxidation tests in an oxygen atmosphere between 800 - 1000°C of different Pt-Al surfaces have been studied and the result of tests showed that the incorporation of Pt into the aluminide coatings enhance the oxidation resistance (particularly at 1000°C). Furthermore, thermal cyclic oxidation tests showed a remarkable improvement in oxide adherence over the simple aluminides.

Subjects/Keywords: 669; Nickel-based superalloys

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APA (6^th Edition):

Hanna, M. D. (1982). The formation of platinum aluminide coatings on IN-738 and their oxidation resistance. (Doctoral Dissertation). University of Sheffield. Retrieved from http://etheses.whiterose.ac.uk/2946/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280551

Chicago Manual of Style (16^th Edition):

Hanna, Muayyad Dawood. “The formation of platinum aluminide coatings on IN-738 and their oxidation resistance.” 1982. Doctoral Dissertation, University of Sheffield. Accessed March 09, 2021. http://etheses.whiterose.ac.uk/2946/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280551.

MLA Handbook (7^th Edition):

Hanna, Muayyad Dawood. “The formation of platinum aluminide coatings on IN-738 and their oxidation resistance.” 1982. Web. 09 Mar 2021.

Vancouver:

Hanna MD. The formation of platinum aluminide coatings on IN-738 and their oxidation resistance. [Internet] [Doctoral dissertation]. University of Sheffield; 1982. [cited 2021 Mar 09]. Available from: http://etheses.whiterose.ac.uk/2946/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280551.

Council of Science Editors:

Hanna MD. The formation of platinum aluminide coatings on IN-738 and their oxidation resistance. [Doctoral Dissertation]. University of Sheffield; 1982. Available from: http://etheses.whiterose.ac.uk/2946/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280551

3. Jones, Robert Edward. Bondcoat developments for thermal barrier coatings.

Degree: PhD, 1999, Sheffield Hallam University

URL: http://shura.shu.ac.uk/3137/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297858

► The prime design considerations for modern nickel based superalloys for use in aero gas-turbine engines, are those of mechanical performance, namely good resistance to creep… (more)

▼ The prime design considerations for modern nickel based superalloys for use in aero gas-turbine engines, are those of mechanical performance, namely good resistance to creep and fatigue with good toughness and microstructural phase stability. Design of the current generation of superalloys has attained these properties at the expense of environmental resistance. This design philosophy has lead to the widespread use of surface coatings technology to protect hot-section componentry from the harsh operating environment. The ongoing drive towards higher operating temperatures has lead to an interest, over the last few years, in thermal barrier coatings (TBCs). TBCs are duplex coating systems consisting of a thin, insulating, ceramic layer over a metallic bondcoat. The bondcoat provides both environmental protection and the necessary adhesive interface to maintain the adherence of the ceramic during the rigours of operation. Central to the performance of a TBC system is the integrity and adherence of the alumina scale promoted by the bondcoat. This study aimed to design and optimise a novel bondcoat system that was capable of out-performing the current generation of bondcoats and progress the resultant coating into a production ready status. This was achieved by comparing the performance of a range of bondcoats of both novel and standard compositions, using the modified scratch test in conjunction with hot isothermal and cyclic furnace tests. The down selected system was then analysed using a range of techniques including optical and electron microscopy, XRD, WDS and SIMS in order to understand the failure mechanisms. The results of the testing programme lead to bondcoat chemistry changes and processing improvements that enabled better performance to be achieved. The bondcoat was optimised and taken to a production standard by using the Taguchi Method of fractional factorial experimental design. The resultant coating system offered a higher TBC/bondcoat interface temperature capability and extended the life of the system at more moderate temperatures, beyond that offered by systems currently available. The coating system has subsequently been run as a bondcoat for EB-PVD TBCs and has successfully completed the duty cycles on a number of development and test engines.

Subjects/Keywords: 620.11223; Nickel based superalloys

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APA (6^th Edition):

Jones, R. E. (1999). Bondcoat developments for thermal barrier coatings. (Doctoral Dissertation). Sheffield Hallam University. Retrieved from http://shura.shu.ac.uk/3137/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297858

Chicago Manual of Style (16^th Edition):

Jones, Robert Edward. “Bondcoat developments for thermal barrier coatings.” 1999. Doctoral Dissertation, Sheffield Hallam University. Accessed March 09, 2021. http://shura.shu.ac.uk/3137/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297858.

MLA Handbook (7^th Edition):

Jones, Robert Edward. “Bondcoat developments for thermal barrier coatings.” 1999. Web. 09 Mar 2021.

Vancouver:

Jones RE. Bondcoat developments for thermal barrier coatings. [Internet] [Doctoral dissertation]. Sheffield Hallam University; 1999. [cited 2021 Mar 09]. Available from: http://shura.shu.ac.uk/3137/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297858.

Council of Science Editors:

Jones RE. Bondcoat developments for thermal barrier coatings. [Doctoral Dissertation]. Sheffield Hallam University; 1999. Available from: http://shura.shu.ac.uk/3137/ ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297858

Clemson University

4. Richardson, Boyce. Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys.

Degree: MS, Mechanical Engineering, 2013, Clemson University

URL: https://tigerprints.clemson.edu/all_theses/1054

► The formation of subsurface damage during machining of nickel-based superalloys is a critical quality concern for the manufacture of gas turbine components. The identification and… (more)

Subjects/Keywords: Image Analysis; Machining Affected Zone; Milling; Nickel-Based Superalloys; Mechanical Engineering

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APA (6^th Edition):

Richardson, B. (2013). Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys. (Masters Thesis). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_theses/1054

Chicago Manual of Style (16^th Edition):

Richardson, Boyce. “Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys.” 2013. Masters Thesis, Clemson University. Accessed March 09, 2021. https://tigerprints.clemson.edu/all_theses/1054.

MLA Handbook (7^th Edition):

Richardson, Boyce. “Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys.” 2013. Web. 09 Mar 2021.

Vancouver:

Richardson B. Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys. [Internet] [Masters thesis]. Clemson University; 2013. [cited 2021 Mar 09]. Available from: https://tigerprints.clemson.edu/all_theses/1054.

Council of Science Editors:

Richardson B. Identification of and Effects on the Depth of the Machining Affected Zone in Nickel-Based Superalloys. [Masters Thesis]. Clemson University; 2013. Available from: https://tigerprints.clemson.edu/all_theses/1054

5. Nicolay, Alexis. Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature.

Degree: Docteur es, Mécanique numérique et Matériaux, 2019, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2019PSLEM067

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En raison de leurs bonnes propriétés à haute température, les superalliages base nickel polycristallins sont largement employés pour la fabrication des disques de turbine des… (more)

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En raison de leurs bonnes propriétés à haute température, les superalliages base nickel polycristallins sont largement employés pour la fabrication des disques de turbine des moteurs d’avion. Parmi eux, l’Inconel 718 est actuellement le plus employé pour les disques des moteurs civils. De telles pièces sont obtenues par forgeage à chaud. Les évolutions microstructurales se produisant au cours de ce procédé sont très sensibles aux conditions de forgeage (température, vitesse et niveau de déformation). Puisque microstructure et propriétés mécaniques sont directement liées, il est de la plus grande importance d’établir l’influence des conditions de forgeage sur les évolutions de microstructure. Cela permet de pouvoir maitriser la microstructure finale des pièces, et donc, leurs propriétés mécaniques. Ces travaux s’intéressent au forgeage en presse à vis de l’Inconel 718, procédé qui est caractérisé par des vitesses de déformation relativement élevées (1s-1 à 100s-1). Ils visent notamment à étudier ce mode de forgeage au regard de celui plus conventionnel réalisé à des vitesses relativement plus faibles (0,001s-1 à 0,1s-1), pour lequel les mécanismes et les cinétiques des évolutions microstructurales sont relativement bien connues, et les propriétés mécaniques contrôlées. L’objectif de ces travaux de thèse est d’établir les liens qui existent entre le mode de forgeage (i.e. la vitesse de déformation), les microstructures résultantes, et les propriétés mécaniques qu’elles impliquent. Des essais de compression à chaud simulant les opérations de forgeage ont été mis en œuvre. La caractérisation fine des microstructures produites lors de ces essais a permis d’établir l’influence de la vitesse de déformation sur les évolutions de microstructure. En particulier, des cinétiques de recristallisation différentes de celles rapportées dans la littérature sont obtenues. Les propriétés en traction et en fluage ont été évaluées sur des éprouvettes prélevées dans des pièces industrielles forgées. L’analyse fine des microstructures dans les têtes a permis d’établir les relations entre les caractéristiques microstructurales et les propriétés mécaniques, puis, de faire le lien avec le mode de forgeage.

Due to their desirable properties at high temperature, polycrystalline nickel-based superalloys are widely used for aircraft engine turbine disk manufacturing. Among the nickel-based superalloys family, Inconel 718 is currently the most popular for civil aircraft engine disks. Such parts are obtained by a hot forging process. Microstructural evolutions occurring during this process are very sensitive to forging conditions (temperature, strain rate and strain level). Given that the microstructure and subsequent mechanical properties are strongly coupled, it is of utmost importance to establish the influence of forging conditions on microstructural evolutions. This relationship, once provided, makes it possible to control the final microstructure of industrial parts, and so their mechanical properties. This work deals with the screw press…

Advisors/Committee Members: Bozzolo, Nathalie (thesis director).

Subjects/Keywords: Superalliages base nickel; Forgeage; Recristallisation; Propriétés mécaniques; Nickel-Based superalloys; Forging; Recristallization; Mechanical properties; 620.112

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APA (6^th Edition):

Nicolay, A. (2019). Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2019PSLEM067

Chicago Manual of Style (16^th Edition):

Nicolay, Alexis. “Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature.” 2019. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed March 09, 2021. http://www.theses.fr/2019PSLEM067.

MLA Handbook (7^th Edition):

Nicolay, Alexis. “Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature.” 2019. Web. 09 Mar 2021.

Vancouver:

Nicolay A. Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2019. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2019PSLEM067.

Council of Science Editors:

Nicolay A. Microstructure et propriétés de l'Inconel 718 DA forgé en presse à vis dans le domaine subsolvus δ : Microstructure and properties of Inconel 718 DA screw press forged at subsolvus δ temperature. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2019. Available from: http://www.theses.fr/2019PSLEM067

Indian Institute of Science

6. Vinay, K S. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.

Degree: MSc Engg, Engineering, 2018, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/4056

► Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their… (more)

▼ Nickel based superalloys are high temperature materials which find application as blade and disc components of jet engines due to their ability to retain their mechanical properties at temperatures close to 0.8 of their melting point. The modern day nickel based superalloys are multicomponent alloys, containing up to 12 alloying elements which are added in balanced proportions to achieve high temperature strength and microstructural stability, Re and Ru have been the recent additions made to superalloy compositions in the last two decades. But the roles of Re and Ru in terms of partitioning among the phases γ and γ’ and its effects on mechanical properties are still not clear. Hence an effort was made to study their effects under constrains of constant volume fractions of γ’ and misfit between γ and γ’, to isolate effects that result purely due to composition. Three model alloy systems (two ternary and one quaternary) of the type Ni-Al-xRe, Ni-Al-yRu and Ni-Al-xRe-yRu, x=2.5/4 and y=2.5/6 with minor additions of 1.4 Hf and 0.07 C for reasons of castability were synthesized by investment casting. This thesis deals with the solidification related aspects of these alloys. Chapter 1 deals with a brief overview of Ni based superalloys in terms of their physical metallurgy, processing, microstructure and the effects of Re and Ru studied in literature. These are summarized and the objective of thesis laid out. The experimental details of the techniques employed for studying the cast structure such as optical microscopy, scanning electron microscopy, electron probe microanalysis and differential scanning calorimetry are discussed in Chapter 2 In Chapter 3, the experimental results concerning microstructure, chemistries (local and global), differential scanning calorimetry and supporting Thermo-Calc based simulations are presented. The composition of the directionally solidified alloys were estimated using quantitative EPMA spot analysis after homogenizing them to the best possible extent. The cooling rates experienced by the bottom, middle and tip sections (25mm, 150mm and 295mm respectively from chill plate) of the model alloys during casting was estimated using ProCASTTM simulations. The simulations show the cooling rates to vary from 12.5 K/min to 6 K/min, corresponding to the range of thermal gradients 3000 K/m to 1500 K/m from bottom to tip sections. These estimations were performed assuming a constant withdrawal velocity of 24 cm/hr. The morphological evolution of cast structure from bottom to tip section of the alloys was studied at a coarse scale with the aid of optical microscopy. A tendency towards increased branching of dendrites to form well developed tertiary arms is observed on moving from bottom to tip sections. Quantitative measurement of primary and secondary arm spacings (PDAS and SDAS) indicate that PDAS values increase from bottom to middle section and then saturates, whereas the SDAS values show an increase from bottom to tip sections. Also, the PDAS and SDAS values of MA-3 were observed to be… Advisors/Committee Members: Banerjee, Dipankar (advisor).

Subjects/Keywords: Nickel Based Superalloys; Solidification Alloys; Alloy Composition; Ni-Based Superalloys; Ni-Al-Re/Ru Alloys; Materials Engineering

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APA (6^th Edition):

Vinay, K. S. (2018). Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. (Masters Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/4056

Chicago Manual of Style (16^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Masters Thesis, Indian Institute of Science. Accessed March 09, 2021. http://etd.iisc.ac.in/handle/2005/4056.

MLA Handbook (7^th Edition):

Vinay, K S. “Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys.” 2018. Web. 09 Mar 2021.

Vancouver:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Internet] [Masters thesis]. Indian Institute of Science; 2018. [cited 2021 Mar 09]. Available from: http://etd.iisc.ac.in/handle/2005/4056.

Council of Science Editors:

Vinay KS. Microstructural Evolution of Directionally Solidified Ni-Al-Re/Ru Alloys. [Masters Thesis]. Indian Institute of Science; 2018. Available from: http://etd.iisc.ac.in/handle/2005/4056

Université de Lorraine

7. Léglise, Mélissa. Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C.

Degree: Docteur es, Chimie, 2018, Université de Lorraine

URL: http://www.theses.fr/2018LORR0228

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Les assiettes de fibrage utilisées pour la production de fibres de verre subissent d’importantes contraintes mécaniques, chimiques et thermiques. Par conséquent, cette pièce se dégrade… (more)

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Les assiettes de fibrage utilisées pour la production de fibres de verre subissent d’importantes contraintes mécaniques, chimiques et thermiques. Par conséquent, cette pièce se dégrade et doit être périodiquement remplacée. Le but de ces travaux est d’augmenter la durée de vie des assiettes de fibrage en améliorant les propriétés mécaniques et chimiques des superalliages qui les constituent. Plus précisément, l’objectif de cette thèse est, dans un premier temps, d’améliorer les alliages utilisés pour le fibrage à 1000°C, puis dans un second temps, de trouver un superalliage pouvant fibrer à 1125°C. Ces travaux ont été menés sur deux familles de superalliages : base nickel et base cobalt. Les propriétés chimiques ont été caractérisées par des essais thermogravimétriques et les propriétés mécaniques par des essais de fluage flexion 3 points. Pour l’alliage base Ni, l’influence des éléments minoritaires subis, Mn et Si, a été étudiée. Les propriétés mécaniques de cet alliage ont fait, ensuite, l’objet d’essais d’amélioration par l’addition de titane, zirconium, tantale, hafnium et de niobium. L’addition d’aluminium a été aussi expérimentée mais ayant pour but d’améliorer les propriétés chimiques de l’alliage. Enfin, des études ont été aussi menées sur l’addition de métaux nobles (Pd et Ru) et de terres rares (Y, La et Ce). Concernant les superalliages base cobalt, l’étude s’est portée sur un alliage base Co qui a antérieurement montré de bonnes propriétés générales pour une utilisation à 1125°C et non à 1000°C. Des variantes avec une teneur abaissée en tantale, sans hafnium et sans tungstène ont été étudiées. Pour clore ces travaux, l’augmentation de la teneur en nickel et un traitement thermique ont été étudiés afin d’améliorer la résistance à l’oxydation de ce second alliage

The fiberizing spinners used to produce the glass fibers undergo sizable mechanical, chemical and thermal solicitations. Therefore, this piece is degraded and must be periodically replaced. The purpose of these works is to increase the lifetime of the fiberizing spinners by improving the mechanical and chemical properties of the superalloys that constitute them. More precisely, the objective of this thesis is, in the first time, to improve the alloys used to fiberize at 1000°C, and in a second time, to find a superalloy that can fiberize at 1125°C. These works are focused on two families of superalloys: nickel-based and cobalt-based. The chemical properties are characterized by the thermogravimetry tests and the mechanical properties by 3 points flexural creep tests. For the Ni-based alloy, the influences of unwanted minority elements, Mn and Si, were studied. The mechanical properties of this alloy are subject to improvement tests by the addition titanium, zirconium, tantalum, hafnium and niobium. The aluminium addition was also experimented but with the aim of improving the chemical properties of the alloy. Finally, the studies were also driven on the addition of noble metals (Pd and Ru) and of rare earths (Y, La and Ce). Concerning the…

Advisors/Committee Members: Berthod, Patrice (thesis director).

Subjects/Keywords: Superalliages; Base nickel; Base cobalt; Chromine; Carbures; Superalloys; Nickel-based; Cobalt-based; Chromia; Carbides; 620.16; 620.143

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APA (6^th Edition):

Léglise, M. (2018). Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2018LORR0228

Chicago Manual of Style (16^th Edition):

Léglise, Mélissa. “Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C.” 2018. Doctoral Dissertation, Université de Lorraine. Accessed March 09, 2021. http://www.theses.fr/2018LORR0228.

MLA Handbook (7^th Edition):

Léglise, Mélissa. “Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C.” 2018. Web. 09 Mar 2021.

Vancouver:

Léglise M. Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C. [Internet] [Doctoral dissertation]. Université de Lorraine; 2018. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2018LORR0228.

Council of Science Editors:

Léglise M. Amélioration des propriétés mécaniques et chimiques de superalliages base nickel et base cobalt de fonderie utilisés pour le fibrage du verre fondu à 1000°C - 1100°C : Improvement of mechanical and chemical properties of cast nickel-based and cobalt-based superalloys used to fiberizing of molten glass at 1000°C - 1100°C. [Doctoral Dissertation]. Université de Lorraine; 2018. Available from: http://www.theses.fr/2018LORR0228

8. Larrouy, Baptiste. Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure.

Degree: Docteur es, Mécanique des solides, des matériaux, des structures et des surfaces, 2014, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2014ESMA0019

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Cette étude s’est focalisée sur la compréhension des mécanismes de déformation et d’endommagementd’un superalliage à base de Nickel (Udimet 720Li) utilisé pour la confection de… (more)

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Cette étude s’est focalisée sur la compréhension des mécanismes de déformation et d’endommagementd’un superalliage à base de Nickel (Udimet 720Li) utilisé pour la confection de disques de turbine hautepression soumis à des sollicitations monotones et cycliques à des températures inférieures à 500 °C.L’amorçage de fissures de fatigue à 20 °C et 465 °C a été systématiquement observé suivant des facettescristallographiques pour différents états métallurgiques. Une étude quantitative des traces de glissementplastique en surface a permis de montrer que cet endommagement est la conséquence d’une nontransmission de la déformation plastique entre grains voisins. Plus précisément, un mécanisme de rotationcristalline localisée au sein de micro-volumes à l’extrémité de bandes de glissement dans le grain voisin aété identifié à l’origine des fissures.Les configurations cristallographiques favorisant ce processus impliquent notamment les relations entresystèmes de glissement de part et d’autre du joint de grains (angle de TWIST), ou encore la présence d’uneprécipitation fine participant au confinement des bandes de glissement.

This study contributes to the understanding of the deformation and damage mechanisms in a Nickelbasedsuperalloy (the Udimet 720Li) used for the manufacturing of aeroengines high pressure turbinedisks submitted to monotonic and cyclic loadings at temperatures below 500 °C under service conditions.Fatigue crack initiation at 20 °C and 465 °C was systematically observed at large crystallographic facetswhatever the microstructure. An extensive quantitative study of the slip activity at the surface showed thatcrack initiation results from a difficult slip transmission between neighbouring grains. In more details, alocalized crystallographic rotation confined in micro-volumes detected at the tip of slip bands interactingwith the grain boundary were identified to trigger crack initiation.The crystallographic configurations favouring such a process are closely related to the TWIST anglebetween active slip systems on each side of the grain boundary and to a dense and fine precipitationconfining the plasticity.Mots-clés

Advisors/Committee Members: Villechaise, Patrick (thesis director), Cormier, Jonathan (thesis director).

Subjects/Keywords: Transmission du glissement; Superalliages à base de nickel; Slip transmission; Ni-based superalloys

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Larrouy, B. (2014). Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2014ESMA0019

Chicago Manual of Style (16^th Edition):

Larrouy, Baptiste. “Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure.” 2014. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed March 09, 2021. http://www.theses.fr/2014ESMA0019.

MLA Handbook (7^th Edition):

Larrouy, Baptiste. “Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure.” 2014. Web. 09 Mar 2021.

Vancouver:

Larrouy B. Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2014. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2014ESMA0019.

Council of Science Editors:

Larrouy B. Mécanismes de déformation et d'amorçage de fissures dans l'alliage Udimet™ 720Li en relation avec les paramètres microstructuraux : Deformation mechanisms and fatigue crack initiation in Udimet 720Li superalloy in relation with microstructure. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2014. Available from: http://www.theses.fr/2014ESMA0019

9. Lundström, Erik. Overload effects on the fatigue crack propagation behaviour in Inconel 718.

Degree: The Institute of Technology, 2012, Linköping UniversityLinköping University

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77494

► In this master thesis, work done in the TURBO POWER project High temperature fatigue crack propagation in nickel-based superalloys during spring 2012 will be… (more)

Subjects/Keywords: Nickel-based superalloys; Inconel 718; fatigue crack propagation; high temperature hold times; overload effects

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Lundström, E. (2012). Overload effects on the fatigue crack propagation behaviour in Inconel 718. (Thesis). Linköping UniversityLinköping University. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77494

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Lundström, Erik. “Overload effects on the fatigue crack propagation behaviour in Inconel 718.” 2012. Thesis, Linköping UniversityLinköping University. Accessed March 09, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77494.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Lundström, Erik. “Overload effects on the fatigue crack propagation behaviour in Inconel 718.” 2012. Web. 09 Mar 2021.

Vancouver:

Lundström E. Overload effects on the fatigue crack propagation behaviour in Inconel 718. [Internet] [Thesis]. Linköping UniversityLinköping University; 2012. [cited 2021 Mar 09]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77494.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Lundström E. Overload effects on the fatigue crack propagation behaviour in Inconel 718. [Thesis]. Linköping UniversityLinköping University; 2012. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-77494

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Tennessee – Knoxville

10. Frederick, Curtis Lee. CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS.

Degree: 2018, University of Tennessee – Knoxville

URL: https://trace.tennessee.edu/utk_graddiss/4952

► The powder bed additive manufacturing process of selective-electron beam melting can produce near net shape parts with nickel based superalloys. Control of grain structure is… (more)

Subjects/Keywords: Selective-Electron Beam Melting; Nickel-based Superalloys; EBSD; Columnar to Equiaxed Transition

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Frederick, C. L. (2018). CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS. (Doctoral Dissertation). University of Tennessee – Knoxville. Retrieved from https://trace.tennessee.edu/utk_graddiss/4952

Chicago Manual of Style (16^th Edition):

Frederick, Curtis Lee. “CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS.” 2018. Doctoral Dissertation, University of Tennessee – Knoxville. Accessed March 09, 2021. https://trace.tennessee.edu/utk_graddiss/4952.

MLA Handbook (7^th Edition):

Frederick, Curtis Lee. “CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS.” 2018. Web. 09 Mar 2021.

Vancouver:

Frederick CL. CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS. [Internet] [Doctoral dissertation]. University of Tennessee – Knoxville; 2018. [cited 2021 Mar 09]. Available from: https://trace.tennessee.edu/utk_graddiss/4952.

Council of Science Editors:

Frederick CL. CONTROL OF GRAIN STRUCTURE IN SELECTIVE-ELECTRON BEAM MELTING OF NICKEL-BASED SUPERALLOYS. [Doctoral Dissertation]. University of Tennessee – Knoxville; 2018. Available from: https://trace.tennessee.edu/utk_graddiss/4952

Université de Lorraine

11. Msakni Malouche, Mariem. Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process.

Degree: Docteur es, Chimie, 2019, Université de Lorraine

URL: http://www.theses.fr/2019LORR0267

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L’usinage électrochimique impulsionnel (Pulse Electro Chemical Machining PECM) est un procédé d’usinage non conventionnel (sans outils coupants) de pièces métalliques à géométrie complexe et nécessitant… (more)

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L’usinage électrochimique impulsionnel (Pulse Electro Chemical Machining PECM) est un procédé d’usinage non conventionnel (sans outils coupants) de pièces métalliques à géométrie complexe et nécessitant des précisions élevées. Cette technique repose sur l’oxydation anodique du métal et se distingue par l’imposition d’un fort courant impulsionnel. Le courant est synchronisé à un mouvement de translation rectiligne et oscillant de la cathode. L’électrolyte est continuellement renouvelé permettant l’évacuation des résidus du métal usiné. Le PECM permet de travailler avec des distances inter-électrodes très faibles (de 0,01 à 0,2 mm) lui assurant une bonne précision dimensionnelle. L’objectif principal de la thèse est de comprendre les phénomènes physico-chimiques liés à la dissolution anodique de superalliages base nickel (René 65 et Inconel 718) dans l’électrolyte usuel NaNO3. Face à la complexité de la microstructure des matériaux étudiés, les différentes phases constituantes ont été synthétisées et étudiées séparément. Il s’avère que les produits de dissolution insolubles formés lors de l’anodisation sont principalement constitués d’oxydes de Ni et de Nb (pour l’Inconel 718) et d’oxydes de Ni, Ti et de W (pour René 65), mais aussi des précipités γ’’ (Ni3Nb), γ’ (Ni3Ti) ainsi que des carbures de W, de Nb de Cr. Quant aux éléments dissous en solution, ce sont principalement les éléments constituants de la matrice austénitique. Ainsi les différentes analyses mettent en avant que le mécanisme de dissolution des deux superalliages résulte d’une dissolution préférentielle des matrices austénitiques, accompagnée de formation d’oxydes et de déchaussement des précipités. Afin d’assurer une dissolution homogène des différentes phases des matériaux, des milieux alternatifs ont été mis au point notamment par ajouts d’agents complexants. Le développement d’un dispositif expérimental de simulation des conditions du PECM en laboratoire a permis d’établir le rendement de dissolution de l’alliage en fonction de différentes densités de courants en milieux usuel et alternatifs. Enfin, une transposition de l’étude de ces milieux alternatifs a été réalisée sur machine PECM. Une méthodologie de plan d’expérience a été utilisée pour l’alliage René 65 afin de comparer l’efficacité d’un électrolyte alternatif à l’électrolyte usuel NaNO3. Ces essais à l’échelle pilote ont été étendus à l’alliage Inconel 718. Il en ressort que la formulation de bains spécifiques à chaque alliage permet de diminuer à la fois la production de boues d’hydroxydes métalliques et de limiter la formation de couches anodiques à la surface des pièces.

Pulse Electro Chemical Machining PECM is an unconventional machining process (with no cutting tools) of complex shapes requiring high precision. This technology is based on the anodic oxidation of the metal and is distinguished by pulsed current synchronized to an oscillation of the cathode with a rectilinear translational movement. The electrolyte is continuously renewed allowing the evacuation of sludge of the…

Advisors/Committee Members: Boulanger, Clotilde (thesis director), Stein, Nicolas (thesis director).

Subjects/Keywords: Superalliages base nickel; Dissolution anodique; PECM; Électrolytes; Nickel based superalloys; Anodic dissolution; PECM; Electrolytes; 541.37; 620.16

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Msakni Malouche, M. (2019). Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process. (Doctoral Dissertation). Université de Lorraine. Retrieved from http://www.theses.fr/2019LORR0267

Chicago Manual of Style (16^th Edition):

Msakni Malouche, Mariem. “Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process.” 2019. Doctoral Dissertation, Université de Lorraine. Accessed March 09, 2021. http://www.theses.fr/2019LORR0267.

MLA Handbook (7^th Edition):

Msakni Malouche, Mariem. “Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process.” 2019. Web. 09 Mar 2021.

Vancouver:

Msakni Malouche M. Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process. [Internet] [Doctoral dissertation]. Université de Lorraine; 2019. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2019LORR0267.

Council of Science Editors:

Msakni Malouche M. Usinage par Pulse ElectroChemical Machining (PECM) de superalliages base nickel employés pour des pièces aéronautiques fortement sollicitées thermomécaniquement : compréhension des phénomènes physicochimiques et optimisation du procédé : Pulse ElectroChemical Machining (PECM) of nickel based superalloys used for aeronautical parts with high thermomechanical demands : understanding of physicochemical phenomena and optimization of the process. [Doctoral Dissertation]. Université de Lorraine; 2019. Available from: http://www.theses.fr/2019LORR0267

12. Charpagne, Marie-Agathe. Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions.

Degree: Docteur es, Science et génie des matériaux, 2016, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2016PSLEM041

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Les alliages à base Nickel polycristallins sont largement utilisés pour les pièces aéronautiques soumises à des sollicitations extrêmes en service. Des objectifs toujours plus ambitieux… (more)

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Les alliages à base Nickel polycristallins sont largement utilisés pour les pièces aéronautiques soumises à des sollicitations extrêmes en service. Des objectifs toujours plus ambitieux en termes de rendement énergétique des moteurs d’avions ont conduit les constructeurs à augmenter leur température de fonctionnement. Les nuances utilisées jusqu’alors dans les parties chaudes, tels que l’Inconel 718, n’ont pas une tenue mécanique suffisante à ces températures. Le René 65 est un nouvel alliage à microstructure γ-γ’ élaboré spécifiquement pour ces applications. Il a été retenu par Safran Aircraft Engines comme constituant des disques de turbine basse pression du nouveau turboréacteur LEAP. Pour garantir la bonne tenue des disques, une microstructure fine et homogène est requise. Le procédé de forgeage de ces pièces est une séquence d’étapes de déformation à chaud et de traitements thermiques, durant lesquelles la microstructure évolue. Si les phénomènes physiques gouvernant les évolutions microstructurales sont connus, leurs mécanismes exacts et leurs cinétiques varient d’un alliage à l’autre.Des essais de déformation à chaud ont été réalisés en laboratoire dans différentes conditions de température, vitesse et taux de déformation représentatifs des procédés industriels. L’étude précise des mécanismes de recristallisation dynamique, ainsi que de leurs cinétiques, constitue la première partie de ce travail. La caractérisation fine des microstructures déformées a permis de mettre en évidence un nouveau mécanisme de recristallisation, dit de recristallisation en hétéroépitaxie, qui se superpose aux autres mécanismes conventionnels. L’interaction entre ces différents mécanismes ainsi que leurs cinétiques relatives ont été établies dans une vaste gamme de conditions de déformation. Il est démontré que ce mécanisme de recristallisation s'applique également à d'autres alliages γ-γ’. La deuxième partie de l’étude est consacrée à la stabilité des microstructures déformées lors de leur exposition à haute température. L'alliage René 65, comme d’autres alliages à base Nickel, est sensible à un phénomène indésirable dit de croissance sélective de grains. Ses conditions de déclenchement ont été déterminées, de manière à délimiter une fenêtre de forgeage critique. Les mécanismes microstructuraux à l’origine de ce phénomène ont été discutés, ainsi que la possibilité d’une solution préventive.

Polycrystalline Nickel-based alloys are widely used as components for rotative parts of jet engines submitted to extreme conditions. Endlessly increasing objectives in terms of energy efficiency have led the engine manufacturers to increase their service temperature. As a consequence, Inconel 718 and similar alloys -that were used until now- cannot withstand such severe conditions anymore, and lack mechanical resistance at the increased temperature. René 65 is a new γ-γ’ superalloy which has been designed specifically for that purpose by General Electric. It has been selected by Safran Aircraft Engines as the material for low-pressure turbine…

Advisors/Committee Members: Bozzolo, Nathalie (thesis director).

Subjects/Keywords: Superalliages à base-nickel polycristallins; Forgeage à chaud; Recristallisation; Croissance de grains; Polycrystalline nickel-based superalloys; Forging; Recrystallization; Grain growth; 620.11

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Charpagne, M. (2016). Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2016PSLEM041

Chicago Manual of Style (16^th Edition):

Charpagne, Marie-Agathe. “Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions.” 2016. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed March 09, 2021. http://www.theses.fr/2016PSLEM041.

MLA Handbook (7^th Edition):

Charpagne, Marie-Agathe. “Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions.” 2016. Web. 09 Mar 2021.

Vancouver:

Charpagne M. Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2016. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2016PSLEM041.

Council of Science Editors:

Charpagne M. Evolutions de microstructure au cours du forgeage de l'alliage René 65 : rheological and microstructural behavior of y/y' Ni-based superalloy under hot forging conditions. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2016. Available from: http://www.theses.fr/2016PSLEM041

13. Le Guevel, Yves. Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods.

Degree: Docteur es, Chimie des matériaux, 2016, La Rochelle

URL: http://www.theses.fr/2016LAROS003

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Les superalliages à base nickel des turbines aéronautiques sont susceptibles de subir des phénomènes de corrosion et/ou d’oxydation à haute température par les environnements agressifs… (more)

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Les superalliages à base nickel des turbines aéronautiques sont susceptibles de subir des phénomènes de corrosion et/ou d’oxydation à haute température par les environnements agressifs rencontrés en service. Aussi, des revêtements d’aluminure sont appliqués par dépôt chimique afin d’assurer la protection des pièces contre ces phénomènes. La dégradation progressive de ces revêtements mène à la nécessité de les enlever afin d’en appliquer des nouveaux. Les bains chimiques industriels pour enlever les revêtements et les oxydes sont très toxiques, polluants et plutôt empiriques. Ainsi, ce travail de thèse se proposait d’étudier une méthode alternative et originale, par voie électrochimique permettant de contrer les limitations des approches chimiques. La voie électrochimique par application d’un potentiel (mode potentiostatique) a été étudiée afin de procurer la sélectivité entre le substrat et le revêtement lors de la dissolution, ainsi que le contrôle in-situ du procédé à l’aide d’une cellule à 3 électrodes. La faisabilité de la méthode a d’abord été démontrée, puis différentes procédures (par cycles cathodique/anodique, en continu et, parfois, avec modification du potentiel imposé) ont été développées. Nous avons pu mettre en relation les états métallurgiques des systèmes revêtement/substrat avec leur comportement électrochimique et avons mis également en lumière que le taux de dissolution est principalement gouverné par la concentration d’aluminium dans le revêtement alors que lorsque le platine est incorporé à ce même revêtement, le taux de dissolution est homogène. De même, nous avons démontré par XPS et par MET que la teneur en chrome modifie de manière significative l’homogénéité du décapage lors des phases de polarisation cathodique par un mécanisme de passivation de la surface, qui bloque l’activité électrochimique. Cependant, la tenue en oxydation cyclique des revêtements décapés par voies chimique et électrochimique n’a pas pu véritablement être démontrée car les revêtements avaient une microstructure différente. Enfin, des essais sur pièces de turbine ont montré le haut degré de sélectivité de l’approche ici étudiée.

Nickel based superalloys of aeronautical turbines are subjected to high temperature oxidation and/or corrosion in service conditions. Thus, protective aluminide coatings are applied onto the parts by chemical vapor deposition. The degradation of the coatings with time requires them to be removed prior to recoating the parts. The chemical baths industrially employed are toxic, polluting and quite empirical. Therefore, this thesis aimed at studying an alternative and original electrochemical method to circumvent the drawbacks of the chemical approach. Fixed potentials (potentiostatic mode) were thus applied to provide selectivity between the coating and the substrate upon the dissolution process, as well as to ensure in-situ control through a 3-electrode cell. The feasibility of the method was first demonstrated, then different procedures (cathodic/anodic cycles; continuous anodic and sometimes…

Advisors/Committee Members: Pedraza Diaz, Fernando (thesis director).

Subjects/Keywords: Décapage électrochimique; Superalliages base nickel; Revêtements d’aluminure de nickel; Corrosion haute température; Corrélations électrochimie-métallurgie; Electrochemical stripping; Nickel based superalloys; Nickel aluminide coatings; High temperature corrosion; Correlations electrochemistry-metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Le Guevel, Y. (2016). Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods. (Doctoral Dissertation). La Rochelle. Retrieved from http://www.theses.fr/2016LAROS003

Chicago Manual of Style (16^th Edition):

Le Guevel, Yves. “Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods.” 2016. Doctoral Dissertation, La Rochelle. Accessed March 09, 2021. http://www.theses.fr/2016LAROS003.

MLA Handbook (7^th Edition):

Le Guevel, Yves. “Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods.” 2016. Web. 09 Mar 2021.

Vancouver:

Le Guevel Y. Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods. [Internet] [Doctoral dissertation]. La Rochelle; 2016. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2016LAROS003.

Council of Science Editors:

Le Guevel Y. Dissolution sélective de produits de corrosion et revêtements sur matériaux de turbine aéronautique par méthodes électrochimiques : Selective dissolution of corrosion products and coatings from aero-turbine materials by electrochemical methods. [Doctoral Dissertation]. La Rochelle; 2016. Available from: http://www.theses.fr/2016LAROS003

Ohio University

14. Rich, Jared W. Assessment and Improvement of Wear in Copper Extrusion Dies.

Degree: MS, Mechanical Engineering (Engineering and Technology), 2013, Ohio University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1386080178

► The purpose of this work was to develop a die wear model for superalloy tooling used in multi-channel copper tube extrusion and determine the feasibility… (more)

Subjects/Keywords: Engineering; Materials Science; Mechanical Engineering; Metallurgy; Copper Extrusion Dies; Multi Channel Tubing; CVD Coating Nickel Based Superalloys; Copper Extrusion Die Life; Heat Treating CVD Coated Superalloys

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Rich, J. W. (2013). Assessment and Improvement of Wear in Copper Extrusion Dies. (Masters Thesis). Ohio University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1386080178

Chicago Manual of Style (16^th Edition):

Rich, Jared W. “Assessment and Improvement of Wear in Copper Extrusion Dies.” 2013. Masters Thesis, Ohio University. Accessed March 09, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1386080178.

MLA Handbook (7^th Edition):

Rich, Jared W. “Assessment and Improvement of Wear in Copper Extrusion Dies.” 2013. Web. 09 Mar 2021.

Vancouver:

Rich JW. Assessment and Improvement of Wear in Copper Extrusion Dies. [Internet] [Masters thesis]. Ohio University; 2013. [cited 2021 Mar 09]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1386080178.

Council of Science Editors:

Rich JW. Assessment and Improvement of Wear in Copper Extrusion Dies. [Masters Thesis]. Ohio University; 2013. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1386080178

15. Dornelas, Dante Antonucci. Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247.

Degree: Mestrado, Materiais Metálicos, Cerâmicos e Poliméricos, 2012, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-01102013-105701/ ;

►

A necessidade de trabalhos em altas temperaturas exige o desenvolvimento de materiais com elevada resistência química e mecânica em temperaturas que podem chegar próximas ao… (more)

▼

A necessidade de trabalhos em altas temperaturas exige o desenvolvimento de materiais com elevada resistência química e mecânica em temperaturas que podem chegar próximas ao seu ponto de fusão. Em especial, os materiais empregados devem apresentar bom comportamento em fluência, de modo a suportar a combinação de altas tensões e altas temperaturas com o mínimo de deformação. O presente trabalho visa caracterizar a superliga MAR-M247, fornecida pela empresa Açotécnica, em condições de fluência para a produção de rotores empregados em turbocompressores automotivos. Os trabalhos são divididos em duas etapas. Na primeira estuda-se a melhor combinação de tratamentos térmicos de solubilização e envelhecimento, chegando à condição de solubilização por 5 horas a 1250?C e envelhecimento por 20 horas a 980?C. Um trabalho de outro aluno (SILVA, 2011) realiza o mesmo estudo para uma variação da superliga MAR-M247 em que o tântalo é totalmente substituído por nióbio. Neste caso, a melhor condição de tratamento é solubilização a 1260?C por 8 h seguida de envelhecimento duplo por 5 h a 880?C e 20 h a 780?C. Na segunda etapa, os materiais dos dois trabalhos, nas melhores condições de tratamento para cada um, são testados em condições de fluência a 850?C a 370, 390, 410 e 430 MPa. A superliga convencional apresenta os maiores valores de vida em fluência enquanto a modificada apresenta os maiores valores de ductilidade. A análise de fratura dos materiais ensaiados a 390 e 430 MPa mostra a presença massiva de carbonetos em toda a extensão da microestrutura, apresentando, em muitos casos, uma morfologia de ëscrita chinesa\". Apesar disso, todas as amostras apresentam grande quantidade de vazios, indicando que sua nucleação e crescimento são os responsáveis pela fratura do material.

The needing for high temperature work claim for new materials capable of maintain high strength and good corrosion resistance at temperatures that could reach values near their melting point. Such materials must be creep resistant to withstand high levels of tension and temperature. The aim of this work is the characterization of MAR-M247 under creep conditions for the production of automotive turbocharger rotors made by Açotécnica. The work is split in two steps. In the first one, the material is studied to find the best conditions for solution and ageing heat treatments. The result is a solution treatment at 1250?C for 5 h followed by aging at 980?C for 20 h. A work made by another student (SILVA, 2011) makes the same with a modification of MAR-M247 in which tantalum is completely substituted for niobium. The best condition for this case is a solution treatment at 1260?C for 8 h and a double aging treatment at 880?C for 5 h and 780?C for 20 h. At the second part of the work, both the materials are tested under creep conditions at 850?C with 370, 390, 410 and 430 MPa. The conventional superalloy shows the highest values for creep strength and the modified superalloy shows the highest ductility. Fracture surfaces for 390 and 430 MPa showed brittle…

Advisors/Committee Members: Barboza, Miguel Justino Ribeiro.

Subjects/Keywords: Alta temperatura; Creep; Fluência; High temperature; MAR-M247; MAR-M247; Nickel-based superalloys; Superligas à base de níquel

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dornelas, D. A. (2012). Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/97/97134/tde-01102013-105701/ ;

Chicago Manual of Style (16^th Edition):

Dornelas, Dante Antonucci. “Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247.” 2012. Masters Thesis, University of São Paulo. Accessed March 09, 2021. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-01102013-105701/ ;.

MLA Handbook (7^th Edition):

Dornelas, Dante Antonucci. “Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247.” 2012. Web. 09 Mar 2021.

Vancouver:

Dornelas DA. Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247. [Internet] [Masters thesis]. University of São Paulo; 2012. [cited 2021 Mar 09]. Available from: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-01102013-105701/ ;.

Council of Science Editors:

Dornelas DA. Caracterização mecânica em temperaturas elevadas da Superliga MAR-M247. [Masters Thesis]. University of São Paulo; 2012. Available from: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-01102013-105701/ ;

University of Cambridge

16. Appleton, Matthew Colin. Understanding surface and sub-surface phenomena in nickel-based superalloy castings.

Degree: Doctor of Engineering (EngD), 2017, University of Cambridge

URL: https://www.repository.cam.ac.uk/handle/1810/269361

► Nickel-based superalloys are high-temperature materials, created to operate in the aggressive conditions found within gas turbine engines. Single crystal turbine blades are investment cast, followed… (more)

▼ Nickel-based superalloys are high-temperature materials, created to operate in the aggressive conditions found within gas turbine engines. Single crystal turbine blades are investment cast, followed by a complex series of operations including heat treatment, machining, blasting, etching and polishing to produce a product ready for coating. Coating systems provide environmental protection, tribological resistance and enable efficient gas-path sealing. This thesis seeks to examine the root causes of various defects and features that render components unsuitable for service. The impact of increasing our understanding of these expensive materials is to increase process yield, and thus lower unit costs Investment casting of turbine blades is highly challenging; despite tight process control some variability in manufacturing operations results in scrapped components. Internal surface melting was found on intermediate pressure turbine blades following high-temperature heat-treatment; it consists of a layer enriched in aluminium and tantalum on the surface of the internal cooling passage. The discovery led to a systematic investigation of the silica-based ceramic cores used to form the cooling passage to better understand core / casting interactions. The silica-based core displayed a degree of pressure assisted liquid phase sintering at those locations where the nickel-based superalloy exerted a crushing force on the surface due to differential contraction after solidification. The areas affected matched that which later displayed surface melting. This was clearly related to casting height since the severity of pressure assisted liquid phase sintering could be mapped and decreased with the height of the casting. Further findings include the formation of a thin alumina layer at the interface between the superalloy and the silica-based core, this layer prevents volatilisation or sublimation from the surface of the component during the heat treatment. In the bespoke castings undertaken to further explore this phenomena clear evidence emerged of zircon particles, an integral constituent of the core, pinning the superalloy during the casting process. The result was a rough undulating surface with depressions formed by the hard, immovable zircon particles and peaks where the small silica grains where able to sinter and retreat against the pressure of the superalloy. A theory has been proposed that these zircon particles effectively indent the casting in specific locations at high temperatures. At the top of the casting where more effective stress and strain are experienced, this can translate into local stresses reaching the threshold for inducing recrystallisation during subsequent heat treatment.

Subjects/Keywords: nickel-based superalloys; casting; single crystals; high-temperature coatings; aluminising; diffused platinum plating; gas turbine engines; microscopy

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APA (6^th Edition):

Appleton, M. C. (2017). Understanding surface and sub-surface phenomena in nickel-based superalloy castings. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/269361

Chicago Manual of Style (16^th Edition):

Appleton, Matthew Colin. “Understanding surface and sub-surface phenomena in nickel-based superalloy castings.” 2017. Doctoral Dissertation, University of Cambridge. Accessed March 09, 2021. https://www.repository.cam.ac.uk/handle/1810/269361.

MLA Handbook (7^th Edition):

Appleton, Matthew Colin. “Understanding surface and sub-surface phenomena in nickel-based superalloy castings.” 2017. Web. 09 Mar 2021.

Vancouver:

Appleton MC. Understanding surface and sub-surface phenomena in nickel-based superalloy castings. [Internet] [Doctoral dissertation]. University of Cambridge; 2017. [cited 2021 Mar 09]. Available from: https://www.repository.cam.ac.uk/handle/1810/269361.

Council of Science Editors:

Appleton MC. Understanding surface and sub-surface phenomena in nickel-based superalloy castings. [Doctoral Dissertation]. University of Cambridge; 2017. Available from: https://www.repository.cam.ac.uk/handle/1810/269361

Brno University of Technology

17. Jeřábek, Petr. Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/59109

► This thesis summarizes knowledge about directional solidification of nickel based superalloys in the process of production of gas turbine blades. It focuses on material and… (more)

Subjects/Keywords: niklové superslitiny; usměrněná krystalizace; nukleace; orientovaná zrna; monokrystaly; nickel based superalloys; directional solidification; nucleation; oriented grains; monocrystals

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APA (6^th Edition):

Jeřábek, P. (2018). Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/59109

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jeřábek, Petr. “Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades.” 2018. Thesis, Brno University of Technology. Accessed March 09, 2021. http://hdl.handle.net/11012/59109.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jeřábek, Petr. “Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades.” 2018. Web. 09 Mar 2021.

Vancouver:

Jeřábek P. Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11012/59109.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jeřábek P. Usměrněná krystalizace lopatek spalovacích turbín: Directional solidification of the combustion turbine blades. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/59109

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Clemson University

18. Henderson, Andrew. Updated Force Model for Milling Nickel-based Superalloys.

Degree: PhD, Automotive Engineering, 2012, Clemson University

URL: https://tigerprints.clemson.edu/all_dissertations/1037

► Nickel-based superalloys are commonly used in applications which require high strength and resistance to creep and oxidation in extreme conditions. All nickel-based superalloys are considered… (more)

Subjects/Keywords: Cutting Forces; In-process Monitoring; Milling; Nickel-based Superalloys; Tool Wear; Operations Research, Systems Engineering and Industrial Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Henderson, A. (2012). Updated Force Model for Milling Nickel-based Superalloys. (Doctoral Dissertation). Clemson University. Retrieved from https://tigerprints.clemson.edu/all_dissertations/1037

Chicago Manual of Style (16^th Edition):

Henderson, Andrew. “Updated Force Model for Milling Nickel-based Superalloys.” 2012. Doctoral Dissertation, Clemson University. Accessed March 09, 2021. https://tigerprints.clemson.edu/all_dissertations/1037.

MLA Handbook (7^th Edition):

Henderson, Andrew. “Updated Force Model for Milling Nickel-based Superalloys.” 2012. Web. 09 Mar 2021.

Vancouver:

Henderson A. Updated Force Model for Milling Nickel-based Superalloys. [Internet] [Doctoral dissertation]. Clemson University; 2012. [cited 2021 Mar 09]. Available from: https://tigerprints.clemson.edu/all_dissertations/1037.

Council of Science Editors:

Henderson A. Updated Force Model for Milling Nickel-based Superalloys. [Doctoral Dissertation]. Clemson University; 2012. Available from: https://tigerprints.clemson.edu/all_dissertations/1037

Coventry University

19. Köksal, Sakip. Face milling of nickel-based superalloys with coated and uncoated carbide tools.

Degree: PhD, 2000, Coventry University

URL: http://curve.coventry.ac.uk/open/items/86a6b065-704a-475b-b805-9d3397487ddf/1 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323035

► Face milling machinability investigation of two difficult-to-machine nickel-based superalloys, namely Inconel 718 and Waspaloy, has been carried out with four different types of tungsten carbide… (more)

▼ Face milling machinability investigation of two difficult-to-machine nickel-based superalloys, namely Inconel 718 and Waspaloy, has been carried out with four different types of tungsten carbide tools under various cutting conditions. The tools comprised of one double-layer CVD-TiCN+Al2O3 coated (KC994M), two PVD-TiN coated (KC720 and KC730) and one uncoated (KMF) tungsten carbide tools. The objectives of the study include investigation of tool performance, failure modes and wear mechanisms under the cutting conditions employed. In addition, surface integrity of the machined surfaces, with regard to surface finish, subsurface microhardness and metallographic examination of the subsurface microstructure, was investigated. CVD-coated KC994M gave the best overall performance in terms of tool life at low and high cutting conditions on both workpieces. The second best-performing tool was the uncoated KMF grade which gave as high tool lives as KC994M at lower cutting speeds. However at higher cutting speeds, KMF was generally outperformed by PVD-TiN coated tools. Short tool lives were obtained at higher cutting speeds of 75 and 100 m/min due to premature failure by chipping. Tool wear at low cutting speed range was due to a combination of progressive microchipping and plucking through a fracture/attrition related wear mechanism associated with cyclic workpiece adhesion and detachment and abrasion/diffusion-related flank wear. Plucking and microchipping were the dominant wear mechanisms. Coating layers on the rake face of both CVD and PVD coated tools were almost completely removed within the first few seconds of cutting at all cutting speeds tested, thus becoming ineffective. On the flank face, however, they remained intact for a longer period and hence increasing tools performance at the medium cutting speed range. Analysis of the subsurface microstructures and microhardness measurements showed that plastic deformation was the predominant effect induced onto the machined surface, the degree of which influenced by the cutting speed, tool wear and prolonged machining. In addition surface irregularities in the form of tearing and embedded hard particles were found to occur which was mainly associated with the chipping dominated wear mode.

Subjects/Keywords: 620.11223; nickel-based superalloys, milling machines : Milling machines : Milling (Metal-work) : Nickel alloys

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Köksal, S. (2000). Face milling of nickel-based superalloys with coated and uncoated carbide tools. (Doctoral Dissertation). Coventry University. Retrieved from http://curve.coventry.ac.uk/open/items/86a6b065-704a-475b-b805-9d3397487ddf/1 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323035

Chicago Manual of Style (16^th Edition):

Köksal, Sakip. “Face milling of nickel-based superalloys with coated and uncoated carbide tools.” 2000. Doctoral Dissertation, Coventry University. Accessed March 09, 2021. http://curve.coventry.ac.uk/open/items/86a6b065-704a-475b-b805-9d3397487ddf/1 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323035.

MLA Handbook (7^th Edition):

Köksal, Sakip. “Face milling of nickel-based superalloys with coated and uncoated carbide tools.” 2000. Web. 09 Mar 2021.

Vancouver:

Köksal S. Face milling of nickel-based superalloys with coated and uncoated carbide tools. [Internet] [Doctoral dissertation]. Coventry University; 2000. [cited 2021 Mar 09]. Available from: http://curve.coventry.ac.uk/open/items/86a6b065-704a-475b-b805-9d3397487ddf/1 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323035.

Council of Science Editors:

Köksal S. Face milling of nickel-based superalloys with coated and uncoated carbide tools. [Doctoral Dissertation]. Coventry University; 2000. Available from: http://curve.coventry.ac.uk/open/items/86a6b065-704a-475b-b805-9d3397487ddf/1 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.323035

20. Brossard, Maxime. Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys.

Degree: Docteur es, Chimie des matériaux, 2014, La Rochelle

URL: http://www.theses.fr/2014LAROS018

►

En service, les matériaux constituant les aubes de turbine aéronautique (superalliages à base nickel) sont soumis à des environnements agressifs susceptibles d’altérer leurs propriétés structurales.… (more)

▼

En service, les matériaux constituant les aubes de turbine aéronautique (superalliages à base nickel) sont soumis à des environnements agressifs susceptibles d’altérer leurs propriétés structurales. Les atmosphères oxydantes impliquées sont en général complexes (O2, H2O, CO2, SO2, NOx…), la quantité d’eau présente pouvant en particulier varier selon le régime moteur et les conditions environnantes (nuages, précipitations, humidité de l’air). Pour apporter une protection contre l’oxydation à haute température, on met en œuvre des revêtements alumino-formeurs sur lesquels une barrière thermique peut, de plus, être déposée. Le présent travail se proposait donc d’étudier l’influence de l’eau, sous forme vapeur et/ou liquide, sur le comportement de revêtements alumino-formeurs de référence, ou développés au LaSIE (barbotine d’aluminium, électrodéposition de CeO2), selon différents régimes d’oxydation (isotherme et cyclique). Afin de se rapprocher des conditions en service, une démarche scientifique originale a été proposée avec la mise en œuvre de conditions de vieillissement et post-vieillissement variées, à haute température, lors des phases de refroidissement, ou encore à température ambiante. Les expériences menées ont montré qu’une introduction de vapeur d’eau n’a que peu d’effet en régime isotherme à 1100°C, notamment lorsqu’une couche d’alumine alpha s’est développée en surface. L’ajout d’eau à froid (humidité relative,gouttes d’eau) accroît l’écaillage des couches d’oxydes, au-delà d’un temps d’oxydation critique, alors que l’apport d’eau lors de la phase de refroidissement des cycles thermiques conduit à une dégradation catastrophique des aluminures de nickel par un mécanisme combinant fatigue thermique et piqûration.

Upon service, aero-turbine blades (nickel-based superalloys) are submitted to high temperature degradation that may alter their structural properties. The oxidizing atmospheres are particularly complex (O2, H2O, CO2, SO2, NOx…) with variable water vapour contents as function of the engine regime and the atmospheric conditions (clouds, rain, relative humidity of air). These substrate materials are protected by alumina-forming coatings to improve their oxidation resistance, while additional thermal barrier coatings insulate the hottest parts. This PhD project aims at studying the effect of water (vapour, liquid) on the degradation of conventional and new coatings (Al slurry, electrodeposited CeO2) developed at the LaSIE laboratory under different oxidation regimes (isothermal and cyclic). An approximation to service conditions was proposed through an original methodology in which several oxidation and post-ageing conditions for different oxidation ranges (hot, upon cooling, at room temperature) were performed. The experiments showed little effect of water vapour mixed with air at 1100°C in isothermal conditions, in particular when the alumina scale grew over the surface. In contrast, water-containing environments at room temperature (relative humidity, water drops) increased the spallation of the…

Advisors/Committee Members: Bonnet, Gilles (thesis director), Pedraza Diaz, Fernando (thesis director).

Subjects/Keywords: Eau; Vapeur d'eau; Oxydation à haute température; Revêtements alumino-formeurs; Superalliages à base nickel; Water; Water vapour; High temperature oxidation; Alumina-forming coatings; Nickel-based superalloys

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Brossard, M. (2014). Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys. (Doctoral Dissertation). La Rochelle. Retrieved from http://www.theses.fr/2014LAROS018

Chicago Manual of Style (16^th Edition):

Brossard, Maxime. “Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys.” 2014. Doctoral Dissertation, La Rochelle. Accessed March 09, 2021. http://www.theses.fr/2014LAROS018.

MLA Handbook (7^th Edition):

Brossard, Maxime. “Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys.” 2014. Web. 09 Mar 2021.

Vancouver:

Brossard M. Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys. [Internet] [Doctoral dissertation]. La Rochelle; 2014. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2014LAROS018.

Council of Science Editors:

Brossard M. Influence de l'eau (vapeur, liquide) et du régime d'oxydation sur la dégradation de revêtements alumino-formeurs sur superalliage à base nickel : Influence of water (vapour, liquid) and of the oxidation regime on the high temperature degradation of alumina-forming coatings on Ni-based superalloys. [Doctoral Dissertation]. La Rochelle; 2014. Available from: http://www.theses.fr/2014LAROS018

21. Laurence, Aude. Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65.

Degree: Docteur es, Mécanique des solides, des matériaux, des structures et des surfaces, 2016, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique

URL: http://www.theses.fr/2016ESMA0006

►

Cette étude traite de l'impact du vieillissement thermomécanique sur la microstructure et sur les propriétés mécaniques du nouveau superalliage base Nickel pour disque de turbine… (more)

▼

Cette étude traite de l'impact du vieillissement thermomécanique sur la microstructure et sur les propriétés mécaniques du nouveau superalliage base Nickel pour disque de turbine René 65.Le vieillissement thermique conduit à trois évolutions microstructurales majeures, à savoir la croissance des précipités y' intragranulaires et à la nucléation de particules TCP aux joints de grains accompagnés d'une ségrégation de molybdène. Une méthode innovante basée sur des traitements thermiques adaptés a permis de dissocier les effets de ces deux évolutions microstructurales sur les propriétés en fluage et fatigue-temps de maintien à 700° Cdu René 65. La croissance des précipités y' intragranulaires est majoritairement responsable de l'abattement des propriétés mécaniques. Il s'avère néanmoins que la présence des particules TCP aux joints de grains ainsi que la ségrégation de molybdène affectent également le comportement viscoplastique et la durabilité de l'alliage, contribuant à un abattement supplémentaire des propriétés mécaniques. Ce phénomène est attribué à l'adoucissement localisé de la matrice au voisinage des particules TCP et des joints de grains par la perte d'éléments durcissants de la solution solide y.

This study focused on the impact of thermo-mechanical aging on the microstructure and on the mechanical properties of the new nickel-based superalloy René 65 for turbine disk applications.Thermal aging causes three main microstructural evolutions, namely the intragranular y'-growth, the nucleation of TCP particles at grain boundaries along with a segregation of molybdenurn. An innovative method based on appropriated thermal treatments enabled to dissociate these microstructural evolutions' impacts on the René 65 creep and dwell-fatigue properties at 700°C.The y'-growth is mainly responsible of the overall mechanical proprerties degradation. However, it turns out TCP particles and the molybdenum segregation at grain boundaries also affect negatively the alloy viscoplastic behavior and its durability, contributing to an additional decrease in its mechanical properties. This phenomenon is attributed to the softening of the matrix locally at grain boundaries by solid solution elements depletion in favor of TCP precipitation.

Advisors/Committee Members: Villechaise, Patrick (thesis director), Billot, Thomas (thesis director), Cormier, Jonathan (thesis director).

Subjects/Keywords: Superalliages à base nickel; Croissance des précipités γ’; Phase TCP; Fatigue-temps de maintien; Ni-based superalloys; Γ’-growth; TCP phases; Dwell-fatigue

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Laurence, A. (2016). Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65. (Doctoral Dissertation). Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Retrieved from http://www.theses.fr/2016ESMA0006

Chicago Manual of Style (16^th Edition):

Laurence, Aude. “Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65.” 2016. Doctoral Dissertation, Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique. Accessed March 09, 2021. http://www.theses.fr/2016ESMA0006.

MLA Handbook (7^th Edition):

Laurence, Aude. “Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65.” 2016. Web. 09 Mar 2021.

Vancouver:

Laurence A. Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65. [Internet] [Doctoral dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2016. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2016ESMA0006.

Council of Science Editors:

Laurence A. Impact du sur-vieillissement métallurgique sur le comportement et la durabilité du nouveau superalliage pour disque de turbine René 65 : Microstructure Long-Term Stability and Impact on Mechanical Properties of the Ni-Based Superalloy for Turbine Disk Applications René 65. [Doctoral Dissertation]. Chasseneuil-du-Poitou, Ecole nationale supérieure de mécanique et d'aérotechnique; 2016. Available from: http://www.theses.fr/2016ESMA0006

22. Baldan, Renato. Processamento e caracterização de rotores automotivos da superliga MAR-M247.

Degree: Mestrado, Materiais Metálicos, Cerâmicos e Poliméricos, 2009, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-24102012-130437/ ;

►

A superliga policristalina à base de níquel MAR-M247 foi desenvolvida na década de 70. Sua ótima composição, estabilidade microestrutural, excelente resistência à fluência e à… (more)

▼

A superliga policristalina à base de níquel MAR-M247 foi desenvolvida na década de 70. Sua ótima composição, estabilidade microestrutural, excelente resistência à fluência e à oxidação e boa resistência à corrosão a quente faz dessa superliga uma das mais utilizadas em rotores durante os últimos 20 anos. Os objetivos do presente trabalho são a produção e caracterização microestrutural e mecânica de rotores da superliga MARM247 (10% peso Co, 10W, 8.25Cr, 5.5Al, 3Ta, 1.5Hf, 1Ti, 0.7Mo, 0.15C, 0.05Zr, 0.015B, Ni balanço). Os rotores foram obtidos pela técnica de microfusão por cera perdida na empresa Açotécnica S.A. (Jandira/SP) em diferentes temperaturas de vazamento e isolamento do molde cerâmico. Os materiais foram analisados por microscopia ótica e eletrônica de varredura (MEV/EDS), análise térmica diferencial (DTA), macro/microdureza e ensaios de tração convencional a 25 °C e a 760 °C. Além disso, os materiais passaram por tratamentos térmicos de solubilização e envelhecimento em diferentes temperaturas e tempos a fim de avaliar as mudanças microestruturais. Com a ajuda do software de cálculo termodinâmico Thermocalc foram feitas simulações das relações de fases utilizando a composição média da superliga MAR-M247. Os resultados permitiram obter uma condição de processamento (temperatura de vazamento e condição de isolamento) com maior quantidade de peças sem defeitos. Além disso, os experimentos permitiram definir uma condição ideal para o tratamento térmico de solubilização da superliga MAR-M247.

The polycrystalline nickel-based superalloy MAR-M247 was developed in the 1970s. Its optimal alloy composition, microstructural stability, excellent resistance to creep and oxidation and good resistance to hot corrosion make the MAR-M247 superalloy one of the alloys widely used in turbine rotors during the last 20 years. The aims of the present work are the production and the microstructural and mechanical characterization of rotors made of MAR-M247 superalloy (10 wt. % Co, 10W, 8.25Cr, 5.5Al, 3Ta, 1.5Hf, 1Ti, 0.7Mo, 0.15C, 0.05Zr, 0.015B, Ni balance). The rotors were produced by using the lost-wax technique at different pouring temperatures and isolation of the shell mold at the Açotécnica S.A. company (Jandira/SP). The materials were analyzed by optical and scanning electron microscopy (SEM/EDS), differential thermal analysis (DTA), macro/microhardness and tensile tests at 25 °C and 760 °C. Besides, the materials were submitted to solution and ageing treatments at different temperatures and times in order to evaluate de microstructural changes. With the aid of the thermodynamic calculation software Thermocalc, simulations of phase relations were made using the average composition of the MAR-M247 superalloy. The results allowed to obtain a processing condition (pouring temperature and isolation condition) with larger amount of rotors without defects. Moreover, the experiments allowed to define an ideal solution heat treatment condition of MAR-M247 superalloy.

Advisors/Committee Members: Nunes, Carlos Angelo.

Subjects/Keywords: Fundição por cera perdida; Investment casting; MAR-M247; MAR-M247; MAR-M247 heat treatment; nickel based superalloys; Superligas de níquel; Thermocalc; Thermocalc; Tratamento térmico MAR-M247

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Baldan, R. (2009). Processamento e caracterização de rotores automotivos da superliga MAR-M247. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/97/97134/tde-24102012-130437/ ;

Chicago Manual of Style (16^th Edition):

Baldan, Renato. “Processamento e caracterização de rotores automotivos da superliga MAR-M247.” 2009. Masters Thesis, University of São Paulo. Accessed March 09, 2021. http://www.teses.usp.br/teses/disponiveis/97/97134/tde-24102012-130437/ ;.

MLA Handbook (7^th Edition):

Baldan, Renato. “Processamento e caracterização de rotores automotivos da superliga MAR-M247.” 2009. Web. 09 Mar 2021.

Vancouver:

Baldan R. Processamento e caracterização de rotores automotivos da superliga MAR-M247. [Internet] [Masters thesis]. University of São Paulo; 2009. [cited 2021 Mar 09]. Available from: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-24102012-130437/ ;.

Council of Science Editors:

Baldan R. Processamento e caracterização de rotores automotivos da superliga MAR-M247. [Masters Thesis]. University of São Paulo; 2009. Available from: http://www.teses.usp.br/teses/disponiveis/97/97134/tde-24102012-130437/ ;

Loughborough University

23. Kashinga, Rudolph J. Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys.

Degree: PhD, 2018, Loughborough University

URL: https://repository.lboro.ac.uk/articles/Cyclic_deformation_oxidation_damage_and_fatigue_crack_growth_in_nickel-based_superalloys/9577541 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785433

► Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys have been studied. Strain-controlled low cycle fatigue tests showed strong anisotropy and strain-rate dependency… (more)

▼ Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys have been studied. Strain-controlled low cycle fatigue tests showed strong anisotropy and strain-rate dependency for a directionally solidified alloy. Essentially, the material showed different stiffness and fatigue life when the loading direction was changed from parallel to normal to the solidification direction. Imposition of dwells at peak strain level resulted in stress relaxation. Stabilised evolution of stress amplitude up to failure indicated limited cyclic softening/hardening. Crystal plasticity modelling was carried out to simulate cyclic deformation of the material, using finite element models developed from EBSD analysis of failed specimens. The model showed good predictive capability for the observed low cycle fatigue behaviour. To explain the reduced fatigue life in specimens loaded normal to the solidification direction, a study of stress distribution was conducted using the finite element crystal plasticity model. It was discovered that grain misorientations arising from a cluster of smaller grains caused severe localised stress concentrations, leading to earlier crack initiation and shortened fatigue life. Oxidation damage of single crystal and directionally solidified alloys was studied by testing thin disc specimens under isothermal conditions. Oxidation kinetics was assessed based on thermogravimetric analysis data. To analyse oxidised specimens, focused-ion beam (FIB) sectioning, complemented by SEM-EDS/EDAX analyses, was carried out. Oxidation was evident in the growth of both surface and internal oxides. This resulted in chemical composition changes near exposed surfaces and consequently led to microstructure change due to dissolution of γ'-precipitates. Load-controlled nano-indentation testing was used to rationalise microstructure change due to oxidation damage. At continuum level, deformation of a crack tip subjected to fatigue loading in vacuum and air was studied using finite element simulations for a polycrystalline alloy. In vacuum, material damage was purely mechanical and therefore, described by accumulated plastic strain. In air, a diffusion-based approach was developed and applied to investigate the interaction between fatigue loading and oxygen penetration at a crack tip. For selected loading conditions, progressive increase in oxygen concentration with fatigue cycles was evident. A local compressive stress due to dilatation effect was induced, which compensated part of the tensile stress caused by mechanical loading. A crack-growth criterion based on accumulated plastic strain and oxygen concentration at the crack tip was, therefore, developed to predict the crack growth rates under fatigue-oxidation conditions, in comparison against experimental results. Application of the diffusion-based approach was finally extended to a directionally solidified superalloy. To consider the effects of microstructure, grain-structures and textures were taken into account in the model, from which the influence…

Subjects/Keywords: Mechanical Engineering not elsewhere classified; Low cycle fatigue; Microstructure; Finite element analysis; Stress-distribution; Crack growth; Diffusion-based modelling; Fatigue-oxidation conditions; Superalloys; Nickel

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kashinga, R. J. (2018). Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys. (Doctoral Dissertation). Loughborough University. Retrieved from https://repository.lboro.ac.uk/articles/Cyclic_deformation_oxidation_damage_and_fatigue_crack_growth_in_nickel-based_superalloys/9577541 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785433

Chicago Manual of Style (16^th Edition):

Kashinga, Rudolph J. “Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys.” 2018. Doctoral Dissertation, Loughborough University. Accessed March 09, 2021. https://repository.lboro.ac.uk/articles/Cyclic_deformation_oxidation_damage_and_fatigue_crack_growth_in_nickel-based_superalloys/9577541 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785433.

MLA Handbook (7^th Edition):

Kashinga, Rudolph J. “Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys.” 2018. Web. 09 Mar 2021.

Vancouver:

Kashinga RJ. Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys. [Internet] [Doctoral dissertation]. Loughborough University; 2018. [cited 2021 Mar 09]. Available from: https://repository.lboro.ac.uk/articles/Cyclic_deformation_oxidation_damage_and_fatigue_crack_growth_in_nickel-based_superalloys/9577541 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785433.

Council of Science Editors:

Kashinga RJ. Cyclic deformation, oxidation damage and fatigue crack growth in nickel-based superalloys. [Doctoral Dissertation]. Loughborough University; 2018. Available from: https://repository.lboro.ac.uk/articles/Cyclic_deformation_oxidation_damage_and_fatigue_crack_growth_in_nickel-based_superalloys/9577541 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.785433

Brno University of Technology

24. Vítková, Gabriela. Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/9823

► Materials used for high temperature applications works in a very aggressive environment (oxidation, hot corrosion, erosion, fatigue, creep). Demands on these materials are very high.… (more)

Subjects/Keywords: Difúzní bariéra; AlSi vrstva; Inconel 713LC; niklové superslitiny; mikrostruktura; oxidace; vysokoteplotní koroze; teplotní expozice.; Diffusion barrier; AlSi layer; Inconel 713LC; nickel-based superalloys; microstructure; oxidation; hot corrosion; thermal exposition.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vítková, G. (2019). Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/9823

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vítková, Gabriela. “Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation.” 2019. Thesis, Brno University of Technology. Accessed March 09, 2021. http://hdl.handle.net/11012/9823.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vítková, Gabriela. “Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation.” 2019. Web. 09 Mar 2021.

Vancouver:

Vítková G. Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11012/9823.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vítková G. Studium ochranné vrstvy na bázi AlSi po degradaci: Study of AlSi protective coating after degradation. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/9823

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

25. Šulák, Ivo. Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/25174

► The present diploma thesis is focused on the effect of AlCr layer on the low cycle fatigue behaviour of cast polycrystalline superalloy IN713LC at 800°C.… (more)

Subjects/Keywords: Litá niklová superslitina; Inconel 713LC; povrchová vrstva AlCr; nízkocyklová únava materiálu.; Cast nickel-based superalloys; Inconel 713LC; AlCr layer; low cycle fatigue

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Šulák, I. (2018). Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/25174

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Šulák, Ivo. “Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.” 2018. Thesis, Brno University of Technology. Accessed March 09, 2021. http://hdl.handle.net/11012/25174.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Šulák, Ivo. “Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.” 2018. Web. 09 Mar 2021.

Vancouver:

Šulák I. Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11012/25174.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Šulák I. Účinek AlCr vrstvy na únavové vlastnosti niklové superslitiny IN 713LC za teploty 800 °C: Influence of AlCr Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/25174

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

26. Šulák, Ivo. Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/6493

► Nickel based superalloys are mainly used for high-temperature applications in energetic and aerospace industry. They are exposed to extremely aggressive environment at high temperature with… (more)

Subjects/Keywords: Litá niklová superslitina; Inconel 713LC; povrchová vrstva Al a Al-Si; nízkocyklová únava materiálu.; Cast nickel-based superalloys; Inconel 713LC; Al and Al-Si layer; low cycle fatigue

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Šulák, I. (2019). Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/6493

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Šulák, Ivo. “Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.” 2019. Thesis, Brno University of Technology. Accessed March 09, 2021. http://hdl.handle.net/11012/6493.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Šulák, Ivo. “Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C.” 2019. Web. 09 Mar 2021.

Vancouver:

Šulák I. Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11012/6493.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Šulák I. Vliv Al a Al-Si vrstvy na únavové vlastnosti niklové superslitiny IN713LC za teploty 800 °C: Influence of Al and AlSi Layer to Fatiague Properties of Nickel Superalloy IN 713LC at the Temperature 800°C. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/6493

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

27. Slavíková, Barbora. Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/66905

► This bachelor thesis is dealing with the analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace.… (more)

Subjects/Keywords: nekonvenční metody obrábění; niklové superslitiny; tepelné zpracování; laserové řezání; vysokoteplotní pájení; přetavená vrstva; nonconventional process machining; nickel-based superalloys; heat treatment; laser cutting; brazing; recast layer

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Slavíková, B. (2018). Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/66905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Slavíková, Barbora. “Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace.” 2018. Thesis, Brno University of Technology. Accessed March 09, 2021. http://hdl.handle.net/11012/66905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Slavíková, Barbora. “Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace.” 2018. Web. 09 Mar 2021.

Vancouver:

Slavíková B. Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 09]. Available from: http://hdl.handle.net/11012/66905.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Slavíková B. Analýza vlivu teplotních cyklů na eliminaci přetavené vrstvy materiálů používaných v letectví: Analysis of the influence of temperature cycles on the elimination of recast layer on materials used in aerospace. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/66905

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

28. Divya, V D. Diffusion Studies On Systems Related to Nickel Based Superalloys.

Degree: PhD, Faculty of Engineering, 2013, Indian Institute of Science

URL: http://etd.iisc.ac.in/handle/2005/1948

► Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys… (more)

▼ Superalloys offer high temperature strength, excellent creep, corrosion and oxidation resistances, microstructural stability and good fatigue life at elevated temperatures. The composition of the superalloys has been modified continuously to improve the properties. The addition of Pt improves oxidation resistance without compromising the mechanical properties of the superalloys. To further enhance the performance of the superalloy components, various coatings are applied on them. The-(NiPt)Al intermetallic compound bond coats, which are presently utilized, have certain drawbacks. Diffusion of Al from the bond coat to superalloy during service leads to accumulation of stress near the bond coat. The refractory elements present in superalloy precipitate as topological close packed (TCP) phases in the interdiffusion zone. Consequently, a Pt enriched γ(Ni) + γ’(Ni3Al) phase mixture has been proposed as a possible alternative since TCP phases do not form in the interdiffusion zone. In this thesis, diffusion studies are performed on several binary and ternary systems with the primary purpose of understanding the effect of Pt in Ni based superalloys and also in γ + γ’ phase mixture bond coats. Further, a detailed interdiffusion study is conducted in Mo- and W- based binary and ternary systems to understand the growth of the TCP phases. By performing bulk and multifoil diffusion couple experiments, different diffusion parameters like, inter, intrinsic, tracer, impurity diffusion coefficients and activation energy that are necessary to understand the diffusion mechanism are determined. Additionally using the nanoindentation technique on diffusion couples, variation of mechanical properties such as, hardness and modulus with composition is studied. First, interdiffusion in Ni-Pt, Co-Pt, Co-Ni, Ni-Fe and Co-Fe binary systems is examined. In Ni-Pt and Co-Pt, experimental results show that Pt is the slower diffusing species at all compositions. In both the systems, driving force is found to be the reason for higher values of intrinsic diffusion coefficients observed in the range of 40-60 at. % Pt. Contribution of vacancy wind effect on diffusion parameters is found to be negligible. It is found from the multifoil diffusion couple experiments that Ni is the faster diffusing species in the Co-Ni system. Bulk diffusion couple experiments are conducted in the Co-Ni-Pt and Co-Ni-Fe systems, by coupling binary alloys with the third element. Uphill diffusion is observed for Co and Ni in Pt rich corner of the Co-Ni-Pt system. Main and cross interdiffusion coefficients are calculated at the compositions where two diffusion profiles intersect. In both the systems, the main interdiffusion coefficients are positive over the whole composition range and the cross diffusion coefficients show both positive and negative values at different regions. Hardness measured by performing the nanoindentations on diffusion couples of both the systems, shows the higher values at intermediate compositions. The effect of Pt in and’ phases of Ni-Al… Advisors/Committee Members: Paul, Aloke (advisor), Ramamurty, U (advisor).

Subjects/Keywords: Nickel Based Superalloys; Superalloys; Co-Ni System; Ni-Al-Pt Ternary System; Co-Ni-Mo System; Co-Ni-W Systems; Ni-Pt Systems; Co-Pt Systems; Ni-Mo System; Co-Mo System; Ni-Pt-Al System; Ni-Co-Pt Systems; Ni-Co-Fe Ternary Systems; Metallurgy

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Divya, V. D. (2013). Diffusion Studies On Systems Related to Nickel Based Superalloys. (Doctoral Dissertation). Indian Institute of Science. Retrieved from http://etd.iisc.ac.in/handle/2005/1948

Chicago Manual of Style (16^th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2013. Doctoral Dissertation, Indian Institute of Science. Accessed March 09, 2021. http://etd.iisc.ac.in/handle/2005/1948.

MLA Handbook (7^th Edition):

Divya, V D. “Diffusion Studies On Systems Related to Nickel Based Superalloys.” 2013. Web. 09 Mar 2021.

Vancouver:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Internet] [Doctoral dissertation]. Indian Institute of Science; 2013. [cited 2021 Mar 09]. Available from: http://etd.iisc.ac.in/handle/2005/1948.

Council of Science Editors:

Divya VD. Diffusion Studies On Systems Related to Nickel Based Superalloys. [Doctoral Dissertation]. Indian Institute of Science; 2013. Available from: http://etd.iisc.ac.in/handle/2005/1948

29. Alkelae, Fathia. Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect.

Degree: Docteur es, Science des matériaux, 2016, Lyon

URL: http://www.theses.fr/2016LYSEC015

►

Les alliages à base de Nickel constituent les meilleurs matériaux actuellement développés pour répondre aux sollicitations sous hautes températures dans les domaines de l’aéronautique du… (more)

▼

Les alliages à base de Nickel constituent les meilleurs matériaux actuellement développés pour répondre aux sollicitations sous hautes températures dans les domaines de l’aéronautique du nucléaire etc… L’objectif de ce travail de thèse est d’étudier leur comportement en température sous sollicitations de fretting usure. Dans cette étude, on s’intéresse à un contact René125/Waspaloy représentatif d’une application aéronautique. Dans un premier temps nous avons étudié l’effet de la température. On montre qu’à partir de 400°C, l’interface génère la formation d’une glaze layer lubrifiante qui réduit considérablement la cinétique de l’usure. En fixant la température à 700°C (température de l’application industrielle), nous avons étudié la stabilité de ces couches protectrices vis-à-vis de la pression de contact, de l’amplitude de glissement, de la fréquence et du nombre de cycle appliqués. Cette analyse montre une évolution bilinéaire de l’usure avec une usure initiale rapide liée à la formation de la « glaze layer » puis une usure additionnelle quasiment nulle dès que la « glaze layer » est formée. Ces travaux montrent que le volume d’usure associée à la formation de la « glaze layer » est fonction de la vitesse de glissement. Au dessus d’une vitesse seuil de glissement, la formation de la « glaze layer » protectrice devient plus difficile. Une courbe maîtresse est ainsi établie. Des analyses chimiques des interfaces associées à des essais interrompus ont permis d’établir le scénario de formation de ces glaze layers. Pour finir, une étude comparative des revêtements développés dans le cadre du projet INNOLUB a été menée de façon à sélectionner le revêtement offrant les meilleures propriétés tribologiques pour l’application étudiée.

Nickel based alloys are the most developed materials nowadays for applications at high temperature, as in aeronautics, nuclear…The aim of this study is to understand their behavior at high temperature under fretting wear solicitations. Thereby, we had focused on a tribosystem formed of Waspaloy/René 125, which represent the crankcase/blade contact of the low pressure Turbine. We started studying the temperature effect, it is been noticed that above T = 400°C, a lubricant tribofilm, called the Glaze Layer is generated at the interface of the contact, which enable an abrupt reduction in friction and wear rate. The temperature was than fixed at 700°C (service temperature), so the glaze layer stability was analyzed as a function of contact pressure, sliding amplitude, frequency and number of cycles imposed. This analysis shows a bilinear wear evolution, characterized by a fast initial wear related to the formation of the glaze layer, followed by almost no wear once the glaze layer is formed. This study showed that the wear rate related to the glaze layer formation is dependent of the sliding velocity. Above a sliding velocity threshold, the formation of a stabilized glaze layer is quite difficult. A Master curve is here established. Microscopic and spectroscopic investigations are conducted to…

Advisors/Committee Members: Fouvry, Siegfried (thesis director).

Subjects/Keywords: Fretting-usure; Tribologie; Alliages de nickel; Couches glacées; Revêtements; Oxydation à chaud; Haute température; Turbine basse pression; Troisième corps; Spectroscopie Raman; Fretting-wear; Tribology; Nickel based superalloys; Glaze layers; Coatings; High temperature; Low pressure turbine; Third body; Raman spectroscopy; Oxides formation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alkelae, F. (2016). Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2016LYSEC015

Chicago Manual of Style (16^th Edition):

Alkelae, Fathia. “Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect.” 2016. Doctoral Dissertation, Lyon. Accessed March 09, 2021. http://www.theses.fr/2016LYSEC015.

MLA Handbook (7^th Edition):

Alkelae, Fathia. “Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect.” 2016. Web. 09 Mar 2021.

Vancouver:

Alkelae F. Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect. [Internet] [Doctoral dissertation]. Lyon; 2016. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2016LYSEC015.

Council of Science Editors:

Alkelae F. Etude en fretting usure sous hautes températures d'un contact Waspaloy/René125 : formation et stabilité des "glaze layers" : Study of Nickel based super-alloys under fretting wear sollicitations at high temperature : Glaze layer effect. [Doctoral Dissertation]. Lyon; 2016. Available from: http://www.theses.fr/2016LYSEC015

30. Dirand, Laura. Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments.

Degree: Docteur es, Science et ingénierie des matériaux et métallurgie, 2011, Lorraine INP

URL: http://www.theses.fr/2011INPL079N

►

Les superalliages monocristallins à base de nickel sont utilisés en aéronautique pour les aubes de turbines. Cette étude est consacrée à la modélisation du comportement… (more)

▼

Les superalliages monocristallins à base de nickel sont utilisés en aéronautique pour les aubes de turbines. Cette étude est consacrée à la modélisation du comportement en fluage du superalliage monocristallin AM1 après mise en radeaux, au cours d’essais isothermes à contrainte variable. Des diffractogrammes (200) ont été obtenus in situ par diffractométrie trois axes en rayonnement synchrotron, à haute température (950-1150°C) pour des paliers de contrainte entre 0 et 300MPa. Pour chaque phase, les déformations élastiques se déduisent de la position des pics et les contraintes, déformations plastiques et vitesses de déformation sont obtenues par la mesure du désaccord paramétrique, en utilisant un modèle composite en série. Ces résultats sont combinés à une caractérisation post mortem en microscopie électronique : morphologie des phases, densité et nature des dislocations. La mesure in situ du désaccord paramétrique donne accès à la densité instantanée de dislocations aux interfaces y/y’. Dans la phase ylors d’incréments de la contrainte appliquée, la contrainte de Von Mises augmente, puis se relaxe jusqu’à une contrainte seuil. Cette contrainte est en accord avec la contrainte d’Orowan et les largeurs des couloirs mesurées post mortem. La déformation plastique de la phase y’ est produite par montée de dislocations de vecteur de Burgers perpendiculaire à l’axe de traction sous l’action de la seule contrainte transverse et contrôlée par l’entrée de dislocations depuis les interfaces. Une simulation des pics de diffraction permet de reproduire l’évolution de leur largeur en fonction de la nature et de la répartition des dislocations aux interfaces et dans la phase y'

Nickel-based superalloys are used in aeronautics for turbine blades. This study aims at modelling the creep behaviour of single-crystalline AM1 superalloy with a rafted γ/γ’ microstructure during isothermal tests under variable applied stresses. (200) diffraction profiles are obtained with a triple crystal diffractometer and high energy synchrotron radiation at high temperature (950-1150°C) with an applied stress varying between 0 and 300 MPa. For each phase, the elastic strain is deduced from the peaks’ positions and the stress, plastic strain rate from the lattice mismatch, assuming a model lamellar composite material. Post mortem characterizations by electronic microscopy completes the results: morphology of each phase, dislocations densities and nature. The measurement of lattice mismatch leads to an in situ estimation of the dislocations’ density at the γ/γ’ interfaces. For the γ phase, during successive jumps of the applied stress, the Von Mises stress increases and then relaxes down to a threshold stress. This stress is in agreement with Orowan stress deduced from the post mortem measurements of the γ channels’ width. Plastic strain of the γ' phase is produced by climb of dislocations with Burgers’ vectors perpendicular to the tensile axis under the mere transversal stress and is controlled by the entrance of dislocations into the rafts from…

Advisors/Committee Members: Jacques, Alain (thesis director).

Subjects/Keywords: Superalliage à base nickel; Monocristal; Fluage; Diffraction de Rayons X; Synchrotron; Microscopie électronique; Désaccord paramétrique; Dislocation; Superalloys nickel-based; Single Crystal; Creep; X-Ray Diffraction; Synchrotron; Lectron Microscopy; Misfit; Dislocation; 620.112 6

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dirand, L. (2011). Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments. (Doctoral Dissertation). Lorraine INP. Retrieved from http://www.theses.fr/2011INPL079N

Chicago Manual of Style (16^th Edition):

Dirand, Laura. “Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments.” 2011. Doctoral Dissertation, Lorraine INP. Accessed March 09, 2021. http://www.theses.fr/2011INPL079N.

MLA Handbook (7^th Edition):

Dirand, Laura. “Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments.” 2011. Web. 09 Mar 2021.

Vancouver:

Dirand L. Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments. [Internet] [Doctoral dissertation]. Lorraine INP; 2011. [cited 2021 Mar 09]. Available from: http://www.theses.fr/2011INPL079N.

Council of Science Editors:

Dirand L. Fluage à haute température d’un superalliage monocristallin : expérimentation in situ en rayonnement synchrotron : High temperature creep deformation of nickel-based superalloys : in situ high energy X- Rays Diffraction experiments. [Doctoral Dissertation]. Lorraine INP; 2011. Available from: http://www.theses.fr/2011INPL079N

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