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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.
2017-10-05
Source PublicationELSEVIER SCI LTD
ISSN0264-1275
Volume131Pages:441-449
AbstractCyclic 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.
description.department[liu, liu ; sun, xudong ; zhang, haifeng] northeastern univ, sch mat sci & engn, shenyang 110819, liaoning, peoples r china ; [liu, liu ; meng, jie ; liu, jinlai ; jin, tao ; zhang, haifeng] chinese acad sci, inst met res, superalloys div, shenyang 110016, liaoning, peoples r china
KeywordSingle Crystal Superalloy Low Cycle Fatigue Deformation Anisotropy Deformation Mechanism
Subject AreaMaterials Science, Multidisciplinary
Funding OrganizationNational Natural Science Foundation of China [51571196, 51671188, 51601192]
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/79049
Collection中国科学院金属研究所
Corresponding AuthorMeng, J (reprint author), Chinese Acad Sci, Inst Met Res, Superalloys Div, Shenyang 110016, Liaoning, Peoples R China.
Recommended Citation
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.
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