Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism

doi:10.1016/j.msea.2021.141588

IMR OpenIR

	Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism
	Hou, Kunlei 1,2; Ou, Meiqiong 1; Wang, Min 1; Hao, Xianchao 1; Ma, Yingche 1; Liu, Kui 1
通讯作者	Ma, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
	2021-07-13
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	820 页码:13
摘要	The fracture behavior and deformation mechanism of a new casting Ni-based superalloy K4750 during straincontrolled low cycle fatigue (LCF) and stress-controlled high cycle fatigue (HCF) at 600 degrees C were investigated. The crack in LCF originated from surface and propagated perpendicular to the loading direction in a striationsassisted Stage II manner. Whereas, the crack in HCF mostly initiated at large-size inclusions and its propagation followed a crystallographic Stage I mode. The microstructures controlling the alloy failure in the two tests were also different. The crack propagation in LCF was accelerated by MC carbides which induced second cracks in front of the primary crack tip. By contrast, the formation of crack in HCF was more affected by the inclusion, grain size and grain orientation. Their presence in unfavorable forms led to premature failure of the alloy and a substantial scatter in the stress-life data. In addition, STEM observation showed that the deformation in LCF occurred on multiple parallel {111} planes with high density of entangled dislocations. The produced slip bands were in close proximity with average spacing below 0.1 mu m. However, the distribution of slip bands in HCF was more isolated with separation up to a few microns. The dislocations in slip bands often traversed the gamma/gamma ' structure in pairs as constrained by the anti-phase boundary in gamma ' phase. The heterogeneous deformation in highly isolated slip bands was deemed to account for the Stage I cracking in HCF, which was discussed in this study.
关键词	Ni-based superalloy Low cycle fatigue High cycle fatigue Fracture analysis Stage I II cracking Deformation structure
资助者	National Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province of China ; China Postdoctoral Science Foundation
DOI	10.1016/j.msea.2021.141588
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[52001314] ; Natural Science Foundation of Liaoning Province of China[2020BS008] ; China Postdoctoral Science Foundation[2020M671403]
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS记录号	WOS:000668746500002
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：9[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/321006/159909
专题	中国科学院金属研究所
通讯作者	Ma, Yingche; Liu, Kui
作者单位	1.Chinese Acad Sci, Shi Changxu Innovat Ctr Adv Mat, Inst Met Res, Shenyang 110016, Peoples R China 2.Univ Sci & Technol China, Sch Mat Sci & Engn, Hefei 230026, Peoples R China
推荐引用方式 GB/T 7714	Hou, Kunlei,Ou, Meiqiong,Wang, Min,et al. Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2021,820:13.
APA	Hou, Kunlei,Ou, Meiqiong,Wang, Min,Hao, Xianchao,Ma, Yingche,&Liu, Kui.(2021).Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,820,13.
MLA	Hou, Kunlei,et al."Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 820(2021):13.