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RESEARCH PROCESS ON MICROSTRUCTURAL STABILITY AND MECHANICAL BEHAVIOR OF ADVANCED Ni-BASED SINGLE CRYSTAL SUPERALLOYS
Jin Tao; Zhou Yizhou; Wang Xinguang; Liu Jinlai; Sun Xiaofeng; Hu Zhuangqi
Corresponding AuthorJin Tao(tjin@imr.ac.cn)
2015-10-11
Source PublicationACTA METALLURGICA SINICA
ISSN0412-1961
Volume51Issue:10Pages:1153-1162
AbstractNi-based single crystal superalloys have been widely used to produce turbine blades for advanced aero-engines because of the super temperature-related microstructural stability and comprehensive mechanical properties. However, due to effects of the high temperature and complicated stresses in service, the microstructures of superalloys might gradually evolve and fail in different modes. The present paper reviews the progress of microstructural stability and mechanical behavior including the gamma ' phase rafting, TCP phase precipitation, high temperature creep, low cycle fatigue and thermomechanical fatigue of single crystal superalloys. The addition of Ru improves the creep life of superalloys, but also indirectly promotes the occurrence of "topological inversion". On the other hand, with the increase of aging temperature and time, the contents of refractory elements in mu phase rise significantly. With the increase of applied tension stress, more mu phase precipitate from the gamma matrix, whereas inverse tendency is shown under compression stress. Numerous planar defects are formed during precipitation of mu phase, and these defects promote the nucleation of P and R phases. During high temperature and low stress creep, an important dislocation a < 010 > superdislocation is observed, which moves in the gamma ' phase slowly by a combination of slide and climb. Under very high temperature, incubation with accelerating creep rate occurs before the primary stage, which relates to the extending process of the gamma width. At last, the stacking fault energy is significantly reduced after Ru additions, and thus a series of complex deformation mechanisms occur during low cycle fatigue, e.g. stacking faults penetrating gamma/gamma ' interface, trailing a/6 < 112 > Shockley dislocations shearing into the gamma ' phase. During thermomechanical fatigue, the life of superalloys is influenced by the site of crack initiation, microstructural evolution and oxidation resistance.
KeywordNi-based single crystal superalloy microstructural stability mechanical behavior
Funding OrganizationHigh Technology Research and Development Program of China ; National Natural Science Foundation of China
Indexed BySCI
Language英语
Funding ProjectHigh Technology Research and Development Program of China[2014AA-041701] ; National Natural Science Foundation of China[51331005] ; National Natural Science Foundation of China[11332010]
WOS Research AreaMetallurgy & Metallurgical Engineering
WOS SubjectMetallurgy & Metallurgical Engineering
WOS IDWOS:000363997600001
PublisherSCIENCE PRESS
Citation statistics
Cited Times:14[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/121042
Collection中国科学院金属研究所
Corresponding AuthorJin Tao
AffiliationChinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
Recommended Citation
GB/T 7714
Jin Tao,Zhou Yizhou,Wang Xinguang,et al. RESEARCH PROCESS ON MICROSTRUCTURAL STABILITY AND MECHANICAL BEHAVIOR OF ADVANCED Ni-BASED SINGLE CRYSTAL SUPERALLOYS[J]. ACTA METALLURGICA SINICA,2015,51(10):1153-1162.
APA Jin Tao,Zhou Yizhou,Wang Xinguang,Liu Jinlai,Sun Xiaofeng,&Hu Zhuangqi.(2015).RESEARCH PROCESS ON MICROSTRUCTURAL STABILITY AND MECHANICAL BEHAVIOR OF ADVANCED Ni-BASED SINGLE CRYSTAL SUPERALLOYS.ACTA METALLURGICA SINICA,51(10),1153-1162.
MLA Jin Tao,et al."RESEARCH PROCESS ON MICROSTRUCTURAL STABILITY AND MECHANICAL BEHAVIOR OF ADVANCED Ni-BASED SINGLE CRYSTAL SUPERALLOYS".ACTA METALLURGICA SINICA 51.10(2015):1153-1162.
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