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Low cycle fatigue and high cycle fatigue of K4750 Ni-based superalloy at 600 degrees C: Analysis of fracture behavior and deformation mechanism
Hou, Kunlei1,2; Ou, Meiqiong1; Wang, Min1; Hao, Xianchao1; Ma, Yingche1; Liu, Kui1
Corresponding AuthorMa, Yingche(ycma@imr.ac.cn) ; Liu, Kui(kliu@imr.ac.cn)
2021-07-13
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN0921-5093
Volume820Pages:13
AbstractThe 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.
KeywordNi-based superalloy Low cycle fatigue High cycle fatigue Fracture analysis Stage I II cracking Deformation structure
Funding OrganizationNational Natural Science Foundation of China ; Natural Science Foundation of Liaoning Province of China ; China Postdoctoral Science Foundation
DOI10.1016/j.msea.2021.141588
Indexed BySCI
Languageen
Funding ProjectNational Natural Science Foundation of China[52001314] ; Natural Science Foundation of Liaoning Province of China[2020BS008] ; China Postdoctoral Science Foundation[2020M671403]
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000668746500002
PublisherELSEVIER SCIENCE SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/159909
Collection中国科学院金属研究所
Corresponding AuthorMa, Yingche; Liu, Kui
Affiliation1.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
Recommended Citation
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.
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