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Investigation on low-cycle fatigue behaviors of wrought superalloy GH4742 at room-temperature and 700 degrees C
Kong, Wei-Wen1,2; Yuan, Chao1; Zhang, Bao-Ning1; Qin, He-Yong3; Zhao, Guang-Pu3
Corresponding AuthorYuan, Chao(ychao@imr.ac.en)
2019-03-28
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume751Pages:226-236
AbstractLow-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.
KeywordWrought superalloy GH4742 Low-cycle fatigue Fatigue life Cycle hardening and softening Deformation mechanism
DOI10.1016/j.msea.2019.02.075
Indexed BySCI
Language英语
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000463128800025
PublisherELSEVIER SCIENCE SA
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/132482
Collection中国科学院金属研究所
Corresponding AuthorYuan, Chao
Affiliation1.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
Recommended Citation
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.
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