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The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue
Sun CQ(孙成奇); Zhou LL(周玲玲); Liu JL; Wang Y(王垚); Wu XL(武晓雷); Wei YJ(魏宇杰)
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2019-07-01
Volume124Pages:483-492
ISSN0142-1123
Abstract

While fatigue is ubiquitous and is responsible for a large proportion of failure in engineering structures, we understand little regarding the mechanism of crack initiation and early-stage crack growth especially for very high cycle fatigue (VHCF) behavior. We identified in this report the microstructural evolution during interior crack initiation and early growth in a martensitic stainless steel in VHCF regime by constant and variable amplitude loading method. We observed in the post-mortem samples after VHCF a discontinuous gradient layer composed of ultrafine grains and coarse grains in the fractured surfaces using both electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM). The gradient ultrafine grains are resulted from excessive cyclic plastic deformation in the vicinity of the crack origin or crack tip, which promotes the formation of crack initiation. The equivalent crack growth rate in FGA (fine granular area) is also estimated based on the "tree ring" patterns under variable amplitude loading, which is in the magnitude of 10(-12)-10(-11) m/cyc.

KeywordVery high cycle fatigue Gradient microstructure Mechanism of crack initiation Crack growth rate
DOI10.1016/j.ijfatigue.2019.03.026
Indexed BySCI ; EI
Language英语
WOS IDWOS:000470940100044
WOS KeywordFRACTURE SURFACE ; BEARING STEEL ; BEHAVIOR ; LIFE ; MECHANISM ; DEFORMATION ; PROPAGATION ; MICROSTRUCTURE ; FAILURE ; GROWTH
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding ProjectNational Natural Science Foundation of China[91860112] ; National Natural Science Foundation of China[11425211] ; National Natural Science Foundation of China[51701202] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22040503] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020201] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020200] ; Innovation Program[237099000000170004]
Funding OrganizationNational Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program
Classification一类
Ranking1
ContributorWei, Yujie
Citation statistics
Cited Times:5[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/79379
Collection非线性力学国家重点实验室
Recommended Citation
GB/T 7714
Sun CQ,Zhou LL,Liu JL,et al. The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue[J]. INTERNATIONAL JOURNAL OF FATIGUE,2019,124:483-492.
APA Sun CQ,Zhou LL,Liu JL,Wang Y,Wu XL,&Wei YJ.(2019).The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue.INTERNATIONAL JOURNAL OF FATIGUE,124,483-492.
MLA Sun CQ,et al."The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue".INTERNATIONAL JOURNAL OF FATIGUE 124(2019):483-492.
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