Effects of gamma '-precipitate coarseningon tensile properties of Ni base superalloy K44 during long-term aging

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	Effects of gamma '-precipitate coarseningon tensile properties of Ni base superalloy K44 during long-term aging
	Hou, JS; Guo, JT; Zhou, LZ; Ye, HQ
通讯作者	Guo, JT()
	2006-05-11
发表期刊	ACTA METALLURGICA SINICA
ISSN	0412-1961
卷号	42 期号:5 页码:481-486
摘要	The effects of long-term aging (800-900 degrees C, (1-10) x 10(3) h) on the gamma' coarsening characteristics and the mechanical properties of a corrosion resistant Ni base superalloy K44 have been investigated. SEM observation reveals that the coarsening kinetics of gamma' follows LSW theory at different temperatures and the activation energy for gamma' growth is 255 kJ/mol. Morphological instability occurred in relatively small gamma' precipitates during aging process. At room temperature and 900 V, the yield strength decreases with increasing aging temperature and aging time, while a fluctuation of elongation was observed. The dependence of the yield stress on particle size is explained by Labusch-Schwarz hardening theory rather than classical strengthening theory on coherency and mismatch strengthening. Shearing of strong-coupled dislocations is dominant strengthening mechanism.
关键词	Ni base superalloy K44 long-term aging gamma ' precipitate strengthening theory
收录类别	SCI
语种	英语
WOS研究方向	Metallurgy & Metallurgical Engineering
WOS类目	Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000237981200007
出版者	SCIENCE CHINA PRESS
引用统计	被引频次：14[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/87283
专题	中国科学院金属研究所
通讯作者	Guo, JT
作者单位	Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Hou, JS,Guo, JT,Zhou, LZ,et al. Effects of gamma '-precipitate coarseningon tensile properties of Ni base superalloy K44 during long-term aging[J]. ACTA METALLURGICA SINICA,2006,42(5):481-486.
APA	Hou, JS,Guo, JT,Zhou, LZ,&Ye, HQ.(2006).Effects of gamma '-precipitate coarseningon tensile properties of Ni base superalloy K44 during long-term aging.ACTA METALLURGICA SINICA,42(5),481-486.
MLA	Hou, JS,et al."Effects of gamma '-precipitate coarseningon tensile properties of Ni base superalloy K44 during long-term aging".ACTA METALLURGICA SINICA 42.5(2006):481-486.