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) | |
发表期刊 | INTERNATIONAL JOURNAL OF FATIGUE |
2019-07-01 | |
卷号 | 124页码:483-492 |
ISSN | 0142-1123 |
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. |
关键词 | Very high cycle fatigue Gradient microstructure Mechanism of crack initiation Crack growth rate |
DOI | 10.1016/j.ijfatigue.2019.03.026 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000470940100044 |
关键词[WOS] | FRACTURE SURFACE ; BEARING STEEL ; BEHAVIOR ; LIFE ; MECHANISM ; DEFORMATION ; PROPAGATION ; MICROSTRUCTURE ; FAILURE ; GROWTH |
WOS研究方向 | Engineering ; Materials Science |
WOS类目 | Engineering, Mechanical ; Materials Science, Multidisciplinary |
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] |
项目资助者 | National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; Innovation Program |
论文分区 | 一类 |
力学所作者排名 | 1 |
RpAuthor | Wei, Yujie |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/79379 |
专题 | 非线性力学国家重点实验室 |
推荐引用方式 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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