Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures

doi:10.1016/j.jallcom.2018.09.267

CORC > 金属研究所 > 中国科学院金属研究所

	Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures
	Cui, Luqing 1,2; Yu, Jinjiang 1; Liu, Jinlai 1; Su, Xiaofeng 1
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2019-01-30
卷号	773 页码:250-263
关键词	M951G alloy Low cycle fatigue Cyclic stress response Deformation mechanisms Microstructural degradations
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2018.09.267
通讯作者	Yu, Jinjiang(jjyu@imr.ac.cn)
英文摘要	Total strain-controlled low cycle fatigue tests were conducted on the newly designed nickel-base superalloy M951G under different testing conditions; the relationship among cyclic stress responses, microstructural degradations, deformation mechanisms and testing conditions has been established. Results show that both the cyclic hardening and softening behaviors are dependent on the testing temperature and strain amplitude. As the strain amplitude increases both at 900 and 1000 degrees C, M951G alloy exhibits cyclic hardening under low strain amplitudes and cyclic softening under higher strain amplitudes. At 900 degrees C, the initial cyclic hardening is related to the coherent gamma/gamma' interface, parallel dislocation arrays and dislocation bypassing the tiny gamma' particles. At higher strain amplitudes, the initial cyclic softening is due to the higher density of shearing dislocations in gamma' precipitates. At 1000 degrees C, plenty of parallel dislocation arrays present in gamma channels, which reduces the possibility of dislocation interactions from different slip systems and results in initial cyclic hardening. Under higher strain amplitudes, apart from microstructural degradations, dislocations shearing into gamma' precipitates and formation of dislocation networks, the dislocation annihilation and partial loss of coherency of gamma' precipitates are also responsible for the initial cyclic softening at 1000 degrees C. (C) 2018 Published by Elsevier B.V.
资助项目	National Natural Science Foundation of China (NSFC)[51571196] ; National Natural Science Foundation of China (NSFC)[51771191] ; National Natural Science Foundation of China (NSFC)[51701212]
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000449741200030
资助机构	National Natural Science Foundation of China (NSFC)
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/130413]
专题	金属研究所_中国科学院金属研究所
通讯作者	Yu, Jinjiang
作者单位	1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Liaoning, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Anhui, Peoples R China
推荐引用方式 GB/T 7714	Cui, Luqing,Yu, Jinjiang,Liu, Jinlai,et al. Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,773:250-263.
APA	Cui, Luqing,Yu, Jinjiang,Liu, Jinlai,&Su, Xiaofeng.(2019).Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures.JOURNAL OF ALLOYS AND COMPOUNDS,773,250-263.
MLA	Cui, Luqing,et al."Cyclic stress responses of a newly developed nickel-base superalloy at elevated temperatures".JOURNAL OF ALLOYS AND COMPOUNDS 773(2019):250-263.