The creep deformation and fracture behaviors of nickel-base superalloy M951G at 900 degrees C

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	The creep deformation and fracture behaviors of nickel-base superalloy M951G at 900 degrees C
	Cui, Luqing; Su, Huhu; Yu, Jinjiang; Liu, Jinlai; Jin, Tao; Sun, Xiaofeng; Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
	2017-11-07
发表期刊	ELSEVIER SCIENCE SA
ISSN	0921-5093
卷号	707 页码:383-391
摘要	The creep behaviors of M951G alloy were carried out under stress ranging from 240 MPa to 400 MPa at 900 degrees C, and the corresponding deformation mechanisms and fracture behaviors after rupture had been investigated by various techniques. Results showed that both the deformation mechanisms and fracture behaviors were dependent on the applied stress. According to the transmission electron microscope (TEM) observations, the dominant deformation mechanism changed from a combined process of slip and climb of dislocations in matrix channel to shearing of dislocations in gamma' precipitates and cross-slip of dislocations in matrix channel with the applied stress increasing. Fracture behaviors of M951G alloy were characterized using optical microscope (OM) and scanning electron microscope (SEM), which changed from intergranular to transgranular with the increase of applied stress. At low applied stress, M951G alloy was failure in the form of intergranular owing to coalescence of micropores along the grain boundaries. However, at higher applied stress the microcracks initiated at broken carbides in the grain interior, and finally resulted in transgranular fracture. Additionally, creep strain rate also played a key role in determining the transition of creep fracture modes by effect the corresponding temperature of equal strength for grain boundary and grain interior. The values of apparent stress exponent at low and high stress regions were calculated to be 5.14 and 11.13 respectively, which was due to the change of deformation mechanisms and fracture modes with the increase of applied stress.; The creep behaviors of M951G alloy were carried out under stress ranging from 240 MPa to 400 MPa at 900 degrees C, and the corresponding deformation mechanisms and fracture behaviors after rupture had been investigated by various techniques. Results showed that both the deformation mechanisms and fracture behaviors were dependent on the applied stress. According to the transmission electron microscope (TEM) observations, the dominant deformation mechanism changed from a combined process of slip and climb of dislocations in matrix channel to shearing of dislocations in gamma' precipitates and cross-slip of dislocations in matrix channel with the applied stress increasing. Fracture behaviors of M951G alloy were characterized using optical microscope (OM) and scanning electron microscope (SEM), which changed from intergranular to transgranular with the increase of applied stress. At low applied stress, M951G alloy was failure in the form of intergranular owing to coalescence of micropores along the grain boundaries. However, at higher applied stress the microcracks initiated at broken carbides in the grain interior, and finally resulted in transgranular fracture. Additionally, creep strain rate also played a key role in determining the transition of creep fracture modes by effect the corresponding temperature of equal strength for grain boundary and grain interior. The values of apparent stress exponent at low and high stress regions were calculated to be 5.14 and 11.13 respectively, which was due to the change of deformation mechanisms and fracture modes with the increase of applied stress.
部门归属	[cui, luqing ; su, huhu ; yu, jinjiang ; liu, jinlai ; jin, tao ; sun, xiaofeng] chinese acad sci, inst met res, shenyang 110016, liaoning, peoples r china ; [cui, luqing ; su, huhu] univ sci & technol china, sch mat sci & engn, hefei 230026, anhui, peoples r china
关键词	M951g Alloy Stress Level Creep Behavior Deformation Mechanism Creep Fracture Mode
学科领域	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
资助者	National Natural Science Foundation of China (NSFC) [50931004, 51771191, 51571196]
收录类别	SCI
语种	英语
WOS记录号	WOS:000414108200044
引用统计	被引频次：24[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/321006/78983
专题	中国科学院金属研究所
通讯作者	Yu, JJ (reprint author), Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China.
推荐引用方式 GB/T 7714	Cui, Luqing,Su, Huhu,Yu, Jinjiang,et al. The creep deformation and fracture behaviors of nickel-base superalloy M951G at 900 degrees C[J]. ELSEVIER SCIENCE SA,2017,707:383-391.
APA	Cui, Luqing.,Su, Huhu.,Yu, Jinjiang.,Liu, Jinlai.,Jin, Tao.,...&Yu, JJ .(2017).The creep deformation and fracture behaviors of nickel-base superalloy M951G at 900 degrees C.ELSEVIER SCIENCE SA,707,383-391.
MLA	Cui, Luqing,et al."The creep deformation and fracture behaviors of nickel-base superalloy M951G at 900 degrees C".ELSEVIER SCIENCE SA 707(2017):383-391.