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You searched for +publisher:"NSYSU" +contributor:("Yi-Shing Huang"). Showing records 1 – 2 of 2 total matches.

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NSYSU

1. Hsu, Chiung-wen. Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels.

Degree: Master, Materials and Optoelectronic Science, 2011, NSYSU

This study is mainly aimed at interstital-free and dual-phase steels, analyzing the compositions and distribution of selective surface oxides after annealing and then to know the influence of these oxidation for the formation of FeAl inhibition layer in hot-dip galvanizing. Interstital-free and dual-phase steels were first annealed at 800 °C for 1-200 s in a 10% H2-N2 protected atmosphere of -70 °C and 0 °C dew point respectively and then dipped in zinc bath with Al content 0.12-0.18 wt% for 0-20 s. Using this combined SEM, Auger electron spectroscopy(AES), X-ray photoelectron spectroscopy(XPS) and ICP-AES etc. instruments, it is shown that the MnAl2O4 spinels were the major oxidation on the surface of IF steel after annealing. The average oxidation thickness was about 5-15 nm. Annealing times has little effect on the thickness. On the other hand, MnO were observed on DP steel surface after anneaing. The MnO paticles mainly distributed at the grain boundaries ,and the average oxdaiton thickness increase rapidly from 20 nm(10 s) to 110 nm(200 s) with annealing times. The growth of the FeAl inhibition layer can separate to nucleation in initial stage and diffusion growth later. The Fe2Al5 nucleation times were all about 0.1 s in both steels , and average thicknesses were approximately 20 nm. For IF steels , Al uptake in the zinc bath and steel interface was depleted in nucleation stage with 0.12 wt% Al content, so that delayed the growth of Fe2Al5, and the rate determining step was the diffusion of Al in zinc bath. When Al content raise up to 0.14 wt%, the phenomenon of growth delay was not happened, and the rate determining step of Fe2Al5 growth changed to the solid-state diffusion of Fe in Fe2Al5. For DP steels, when Al content up to 0.14 wt%, the growth mechanism was similar to IF steels, but the rate determining step of Fe2Al5 growth was mainly in the grain boundary diffusion of Fe in Fe2Al5. Moreover, where the MnO paticles was rich could obviously observe the delay of Fe2Al5 growth. It was probably because of consuming a great deal of Al to reduce the MnO oxides. Advisors/Committee Members: Liu-Wen Chang (committee member), Der-Shin Gan (chair), Chao-Sung Lin (chair), Yi-Shing Huang (chair).

Subjects/Keywords: nucleation; surface oxides; FeAl inhibition layer; diffusion growth; interstital-free steels; hot-dip galvanizing; dual-phase steels

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

APA (6th Edition):

Hsu, C. (2011). Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808111-131312

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

Chicago Manual of Style (16th Edition):

Hsu, Chiung-wen. “Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels.” 2011. Thesis, NSYSU. Accessed April 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808111-131312.

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

MLA Handbook (7th Edition):

Hsu, Chiung-wen. “Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels.” 2011. Web. 22 Apr 2019.

Vancouver:

Hsu C. Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels. [Internet] [Thesis]. NSYSU; 2011. [cited 2019 Apr 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808111-131312.

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

Council of Science Editors:

Hsu C. Growth Kinetics of the Fe-Al Inhibition Layer in Hot-dip Galvanizing of Interstitial-free and Dual-phase Steels. [Thesis]. NSYSU; 2011. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0808111-131312

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


NSYSU

2. Hsu, Wei-Chih. Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels.

Degree: PhD, Materials and Optoelectronic Science, 2016, NSYSU

The heterogeneity of deformed microstructures of an ULC steel having different cold reductions (30-90%) and two ULC steels with and without dissolved carbon, respectively, were studied in detail using the electron backscatter diffraction, EBSD, technique. The steels were hot rolled to 10 mm, annealed, and cold rolled to 1-7 mm thick. In the first part of the thesis, the cold rolled microstructure and texture were analyzed from the transverse direction (TD). The heterogeneity of deformed microstructures in a meso-scale are categorized into types A, B, and C based on the density of HABs in the original grains. The deformation heterogeneity in a micro-scale is further analyzed by considering the kernel average misorientation (KAM) and the grain average misorientation (GAM), respectively. Two methods of predicting the possible nucleation sites in recrystallization (RX) and the RX texture are proposed accordingly. The first method, HMR+KAM method selects pixels which fulfill a high KAM (>10o) criterion and are located in the high misorientation regions (HMR) are identified as the potential recrystallization nuclei (PRNs). The second method, DIG+GAM method defined areas in deformed matrix which are surrounded by high angle boundaries as the deformed induced grains (DIGs). For those DIGs having low GAM values (<2°) and being smaller than 3 ï­m are defined as the PRNs in recrystallization. The texture of the PRNs selected by each method shows a good correlation with the texture after full RX. The latter method is explained by a modified strain induced boundary migration (SIBM) theory. A quasi in-situ method was employed to study the correlation of the cold rolled (CR) and recrystallized (RX) microstructure and texture in the second part of the thesis. EBSD measurements were carried out for the CR samples prior to annealing, and again for the annealed sample of the same area. The microstructures and textures of steels subjected to 50-90% cold reductions (denoted as A-5, A-7, and A-9) were characterized accordingly. Good similarity of the spatial distribution and texture was found between the pixels selected by the HMR+KAM method and the RX grains for A-5 and A-7. By using the DIG+GAM method, the textures of PRNs and RX grains for A-7 and A-9 show good similarity. Finally, the effect of dissolved carbon to the formation of RX texture by comparing steels A (with dissolved carbon) and steel B (without dissolved carbon) was studied. The evolutions of RX nucleation and texture in specimens of 70% cold reduction (A-7 and B-7) were investigated. Prior to the onset of recrystallization, no significant difference in CR texture between A-7 and B-7 can be found. However, the fully recrystallized A-7 sample shows a stronger Goss texture and a weaker {111}<112> one, as compared to those of B-7. Partially recrystallized specimens with various recrystallization fractions were analyzed by EBSD. Special emphasis is given to PRN sand RX grains of four texture components: {111}<110>, {111}<112>, Goss and cube. The textures of the RX grains… Advisors/Committee Members: Chih-Pu Chang (chair), Liuwen Chang (committee member), Yi-Shing Huang (chair), Po-We Kao (chair), Jui-Chao Kuo (chair), Pei-ling Sun (chair).

Subjects/Keywords: ultra-low carbon steel; deformation structure; texture; recrystallization; electron backscatter diffraction; heterogeneity

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

APA (6th Edition):

Hsu, W. (2016). Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels. (Doctoral Dissertation). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117116-003010

Chicago Manual of Style (16th Edition):

Hsu, Wei-Chih. “Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels.” 2016. Doctoral Dissertation, NSYSU. Accessed April 22, 2019. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117116-003010.

MLA Handbook (7th Edition):

Hsu, Wei-Chih. “Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels.” 2016. Web. 22 Apr 2019.

Vancouver:

Hsu W. Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels. [Internet] [Doctoral dissertation]. NSYSU; 2016. [cited 2019 Apr 22]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117116-003010.

Council of Science Editors:

Hsu W. Study on heterogeneities of deformed structure and evolution of recrystallization texture of ultra-low carbon steels. [Doctoral Dissertation]. NSYSU; 2016. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0117116-003010

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