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The formation of discontinuous gradient regimes during crack initiation in high strength steels under very high cycle fatigue

文献类型：期刊论文

作者Sun, Chengqi1,2; Song, Qingyuan1,2; Zhou, Lingling1; Liu, Jialong3; Wang, Yao1,4; Wu, Xiaolei1,2; Wei, Yujie1,2
刊名INTERNATIONAL JOURNAL OF FATIGUE
出版日期2019-07-01
卷号124页码:483-492
关键词Very high cycle fatigue Gradient microstructure Mechanism of crack initiation Crack growth rate
ISSN号0142-1123
DOI10.1016/j.ijfatigue.2019.03.026
英文摘要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.
WOS关键词FRACTURE SURFACE ; BEARING STEEL ; BEHAVIOR ; LIFE ; MECHANISM ; DEFORMATION ; PROPAGATION ; MICROSTRUCTURE ; FAILURE ; GROWTH
资助项目National 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]
WOS研究方向Engineering ; Materials Science
语种英语
WOS记录号WOS:000470940100044
出版者ELSEVIER SCI LTD
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program ; Innovation Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program ; Innovation Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program ; Innovation Program ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program ; Innovation Program
源URL[http://ir.iggcas.ac.cn/handle/132A11/92518]  
专题中国科学院地质与地球物理研究所
通讯作者Wei, Yujie
作者单位1.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China
2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
4.Beijing Jiaotong Univ, Key Lab Vehicle Adv Mfg Measuring & Control Techn, Beijing 100044, Peoples R China
推荐引用方式
GB/T 7714		 Sun, Chengqi,Song, Qingyuan,Zhou, Lingling,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, Chengqi.,Song, Qingyuan.,Zhou, Lingling.,Liu, Jialong.,Wang, Yao.,...&Wei, Yujie.(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, Chengqi,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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来源：地质与地球物理研究所

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