Effects of crystal orientations on the cyclic deformation behavior in the low cycle fatigue of a single crystal nickel-base superalloy

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	Effects of crystal orientations on the cyclic deformation behavior in the low cycle fatigue of a single crystal nickel-base superalloy
	Liu, Liu; Meng, Jie; Liu, Jinlai; Jin, Tao; Sun, Xudong; Zhang, Haifeng; Meng, J (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China.
刊名	ELSEVIER SCI LTD
	2017-10-05
卷号	131 页码:441-449
关键词	Single Crystal Superalloy Low Cycle Fatigue Deformation Anisotropy Deformation Mechanism
ISSN号	0264-1275
英文摘要	Cyclic stress responses during low cycle fatigue of a Re-bearing Ni-base single crystal superalloy with [001], [011] and [111] orientations have been investigated at 980 degrees C, and attention is paid to the corresponding deformation microstructure to establish a clear microstructure-mechanical relationship. It is found that deformation of the [001] specimens with increased strain amplitude is characterized by cyclic softening at the early stage, while the [011] and [111] specimens exhibit cyclic softening under large strain amplitude and cyclic hardening under small cyclic amplitude. The softening response is related chiefly to the formation of dislocation networks, gamma' degradation and the dislocation recovery process. Moreover, plenty of parallel aligned dislocations in the [011] specimens reduce the probability of dislocation interactions among different slip systems, resulting in cyclic hardening. With respect to the [111] specimens, since a considerable number of dislocations pile up in gamma channels, the resistance of the dislocation movement increases and cyclic hardening is resulted. Our results throw light upon microscopic deformation mechanism responsible for the cyclic stress response behaviors of the alloy with various orientations. (C) 2017 Published by Elsevier Ltd.; Cyclic stress responses during low cycle fatigue of a Re-bearing Ni-base single crystal superalloy with [001], [011] and [111] orientations have been investigated at 980 degrees C, and attention is paid to the corresponding deformation microstructure to establish a clear microstructure-mechanical relationship. It is found that deformation of the [001] specimens with increased strain amplitude is characterized by cyclic softening at the early stage, while the [011] and [111] specimens exhibit cyclic softening under large strain amplitude and cyclic hardening under small cyclic amplitude. The softening response is related chiefly to the formation of dislocation networks, gamma' degradation and the dislocation recovery process. Moreover, plenty of parallel aligned dislocations in the [011] specimens reduce the probability of dislocation interactions among different slip systems, resulting in cyclic hardening. With respect to the [111] specimens, since a considerable number of dislocations pile up in gamma channels, the resistance of the dislocation movement increases and cyclic hardening is resulted. Our results throw light upon microscopic deformation mechanism responsible for the cyclic stress response behaviors of the alloy with various orientations. (C) 2017 Published by Elsevier Ltd.
学科主题	Materials Science, Multidisciplinary
语种	英语
资助机构	National Natural Science Foundation of China [51571196, 51671188, 51601192]
公开日期	2018-01-10
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/79049]
专题	金属研究所_中国科学院金属研究所
通讯作者	Meng, J (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Liu, Liu,Meng, Jie,Liu, Jinlai,et al. Effects of crystal orientations on the cyclic deformation behavior in the low cycle fatigue of a single crystal nickel-base superalloy[J]. ELSEVIER SCI LTD,2017,131:441-449.
APA	Liu, Liu.,Meng, Jie.,Liu, Jinlai.,Jin, Tao.,Sun, Xudong.,...&Meng, J .(2017).Effects of crystal orientations on the cyclic deformation behavior in the low cycle fatigue of a single crystal nickel-base superalloy.ELSEVIER SCI LTD,131,441-449.
MLA	Liu, Liu,et al."Effects of crystal orientations on the cyclic deformation behavior in the low cycle fatigue of a single crystal nickel-base superalloy".ELSEVIER SCI LTD 131(2017):441-449.