Thesis
Grain boundary analysis of HT9 steel under creep test
Washington State University
Master of Science (MS), Washington State University
2010
Handle:
https://hdl.handle.net/2376/103705
Abstract
Ferritic/martensitic steels are attractive materials for use as components in nuclear reactors because of their high strength and good swelling resistance. Grain boundary specific phenomena (such as segregation, voiding, cracking, etc) are prevalent in these materials so grain boundary character is of primary importance. Certain types of boundaries are more susceptible to thermal creep damage whereas others tend to resist damage. If more damage resistant boundaries can be introduced into the structures, this will result in steel that is more resistant to the processes of degradation that prevail in high-temperature environments. In this study, the grain boundary structure in HT9 steel was characterized by electron backscatter diffraction to identify boundaries that are resistant or susceptible to damage in extreme environments. It is found that intergranular damage is mitigated by a high fraction of low angle boundaries, and certain kinds of grain boundaries, such as the [Sigma]3 boundary, are more favored by intergranular cracks.
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Details
- Title
- Grain boundary analysis of HT9 steel under creep test
- Creators
- Zhe Leng
- Contributors
- David P. Field (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525062201842
- Language
- English
- Resource Type
- Thesis