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

CORC > 金属研究所 > 中国科学院金属研究所

	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
刊名	Materials Science and Technology
	2002
卷号	18 期号:1 页码:73-80
关键词	alloy fatigue mechanism in738lc stress
ISSN号	0267-0836
中文摘要	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.
原文出处	://WOS:000174022500011
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/36516]
专题	金属研究所_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.