Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C

doi:10.1016/j.msea.2019.02.075

IMR OpenIR

	Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C
	Kong, Wei-Wen 1,2; Yuan, Chao 1; Zhang, Bao-Ning 1; Qin, He-Yong 3; Zhao, Guang-Pu 3
通讯作者	Yuan, Chao(ychao@imr.ac.en)
	2019-03-28
发表期刊	MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN	0921-5093
卷号	751 页码:226-236
摘要	Low-cycle fatigue (LCF) behavior of wrought superalloy GH4742 was studied at room-temperature (RT) and 700 degrees C. Scanning electron microscope (SEM) and Transmission electron microscope (TEM) were used to study the development of cracks and deformation mechanism. An obvious decrease in fatigue life occurred as the temperature was increased from RT to 700 degrees C and as the total strain amplitude was raised from 0.5% to 1.0%. The Halford-Marrow relationship based on plastic strain energy density was used to predict the fatigue life, which is in good accordance with experimental data. At RT, for all investigated samples, initial cycle hardening is followed by gradual cycle softening especially at higher strain amplitude (Delta(t) >= 0.8%). Detailed TEM observation revealed that y' phase was sheared by dislocations. The shearing mechanism, reducing the ordering degree and diameter of gamma' phase, should be responsible for fatigue softening. Differently, at 700 degrees C, the tested samples exhibited continuous cycle hardening. A sharp drop in the number of stacking faults occurred. Lots of dislocation loops existed around tertiary gamma' phase and paired dislocations moved in secondary gamma' phase, indicating that Orowan and shearing mechanism have occurred. Fatigue cracks usually initiated from the surface. SEM investigation showed that the failure mode changed from transgranular to mixed transgranular and intergranular modes with increasing temperature.
关键词	Wrought superalloy GH4742 Low-cycle fatigue Fatigue life Cycle hardening and softening Deformation mechanism
DOI	10.1016/j.msea.2019.02.075
收录类别	SCI
语种	英语
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:000463128800025
出版者	ELSEVIER SCIENCE SA
引用统计	被引频次：16[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/321006/132482
专题	中国科学院金属研究所
通讯作者	Yuan, Chao
作者单位	1.Chinese Acad Sci, Shenyang Natl Lab Mat 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 3.High Temp Mat Res Inst, Cent Iron & Steel Res Inst, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Kong, Wei-Wen,Yuan, Chao,Zhang, Bao-Ning,et al. Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2019,751:226-236.
APA	Kong, Wei-Wen,Yuan, Chao,Zhang, Bao-Ning,Qin, He-Yong,&Zhao, Guang-Pu.(2019).Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,751,226-236.
MLA	Kong, Wei-Wen,et al."Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 751(2019):226-236.