Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy

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	Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy
	C. Yuan; J. T. Guo; H. C. Yang
	2002
发表期刊	Materials Science and Technology
ISSN	0267-0836
卷号	18 期号:1 页码:73-80
摘要	The effects of grain boundary orientation and cyclic load on the creep and fracture behaviour of directionally solidified superalloy DZ17G have been investigated. The results show that grain boundary orientation has no effect on the creep deformation mechanism, but has a marked effect on the fracture mechanism. The creep fracture mechanism changes from a transgranular mode in longitudinal specimens to intergranular failure in transverse and inclined (45degrees to applied stress axis) specimens. Compared with constant load, cyclic load remarkably reduces creep life with the increment of cyclic frequency, but has no effect on the creep ductility. After careful examination of the transient response following the load changes, it is suggested that an intrinsic softening occurred during unloading, which accelerates the creep deformation rate on subsequent reloading, and the accumulation of this softening effect finally results in cyclic creep acceleration. The contribution of anelasticity has also been discussed.
部门归属	chinese acad sci, inst met res, shenyang 110015, peoples r china.;yuan, c (reprint author), chinese acad sci, inst met res, shenyang 110015, peoples r china
关键词	Alloy Fatigue Mechanism In738lc Stress
URL	查看原文
WOS记录号	WOS:000174022500011
引用统计	被引频次：3[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/321006/36516
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	C. Yuan,J. T. Guo,H. C. Yang. Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy[J]. Materials Science and Technology,2002,18(1):73-80.
APA	C. Yuan,J. T. Guo,&H. C. Yang.(2002).Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy.Materials Science and Technology,18(1),73-80.
MLA	C. Yuan,et al."Effect of grain boundary orientation and cyclic load on creep and fracture behaviour in directionally solidified nickel base superalloy".Materials Science and Technology 18.1(2002):73-80.