Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:etheses.bham.ac.uk:8709". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


University of Birmingham

1. Boswell, John Harold. The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy.

Degree: School of Metallurgy and Materials, 2018, University of Birmingham

There are many challenges associated with the laser powder bed (LPBF) manufacture of high γ' content superalloys such as CM247LC, including anisotropic material properties, micro-cracking during build and low creep ductility at elevated temperatures. This thesis investigates the effects of heat treatment on high temperature creep and tensile properties of CM247LC at 950°C. Cooling rates between 30°C/min and 45°C/min, resulted in serrated grain boundaries lined with γ' and carbides. Solution heat treatment experiments showed that grain growth and recrystallisation plateaued after 1 hour at a temperature of 1265°C. Growth of micro-cracks during HIP can initially be attributed to ductility drop cracking between 450°C and 700°C, but above this temperature strain age cracking SAC is prevalent. Creep strain tests at 950°C showed that the best mechanical properties in terms of creep lives and tensile ductility were obtained by heat treatment using a 2 -stage HIP process, 1230°C, 2 hours - 1270°C, 2 hours, fast cool from HIP followed by a single stage age at 871°C for 16 hours. The principal recommendation from this work is that to improve tensile ductility and creep life of LPBF CM247LC fast cool HIP should replace conventional solution heat treatment followed by gas fan quench (GFQ).

Subjects/Keywords: TN Mining engineering. Metallurgy

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

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

APA (6th Edition):

Boswell, J. H. (2018). The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy. (Thesis). University of Birmingham. Retrieved from http://etheses.bham.ac.uk/8709/

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):

Boswell, John Harold. “The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy.” 2018. Thesis, University of Birmingham. Accessed January 23, 2019. http://etheses.bham.ac.uk/8709/.

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

MLA Handbook (7th Edition):

Boswell, John Harold. “The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy.” 2018. Web. 23 Jan 2019.

Vancouver:

Boswell JH. The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy. [Internet] [Thesis]. University of Birmingham; 2018. [cited 2019 Jan 23]. Available from: http://etheses.bham.ac.uk/8709/.

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

Council of Science Editors:

Boswell JH. The effects of thermal processing on the microstructure and properties of selectively laser melted CM247LC nickel-base superalloy. [Thesis]. University of Birmingham; 2018. Available from: http://etheses.bham.ac.uk/8709/

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

.