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Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime

文献类型：期刊论文

作者Song QY(宋清源)1,2; Sun CQ(孙承奇)1,2; Song QY(宋清源); Sun CQ(孙成奇)
刊名MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
出版日期2020-01-13
卷号771页码:9
ISSN号0921-5093
关键词very high cycle fatigue High strength steels Crack initiation mechanism crack growth rate Grain refinement
DOI10.1016/j.msea.2019.138648
通讯作者Sun, Chengqi(scq@lnm.imech.ac.cn)
英文摘要In this paper, we capture the evolution characteristic of interior crack initiation and early growth of a bearing steel (GCr15) with tensile strength bigger than 2000 MPa in very high cycle fatigue (VHCF) regime by variable amplitude loadings. The traces left on the fracture surface suggest that the equivalent crack growth rate in crack initiation and early growth stage is of the magnitude 10(-12).10(-11) m/cyc. Transmission electron microscopy (TEM) observation further shows that there are discontinuous refined grain regions beneath the fracture surface in the crack Initiation and early growth region. Moreover, the compressive fatigue test is performed on the specimen of a martensitic stainless steel (AISI630) with a pre-crack, and no grain refinement phenomenon is observed in the vicinity of the crack tip and beneath the crack surface by the electron backscatter diffraction (ERSD). The present results support the mechanism of the crack initiation and early growth of high strength steels in VHCF regime: the crack initiation and early growth is attributed to the grain refinement caused by the dislocation interaction over a number of cyclic loadings followed by micro cracks along with the formation of micro cracks irrespective of the grain refinement during the cyclic loading.
分类号一类
WOS关键词FRACTURE SURFACE ; BEARING STEEL ; STRESS RATIO ; LIFE ; PROPAGATION ; BEHAVIOR ; INCLUSION ; FAILURE ; SIZE ; AREA
资助项目National Key R&D Program of China[2017YFA0204402] ; National Natural Science Foundation of China[91860112] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDB22020200]
WOS研究方向Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
语种英语
WOS记录号WOS:000503324700046
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
其他责任者Sun, Chengqi
源URL[http://dspace.imech.ac.cn/handle/311007/81274]  
专题力学研究所_非线性力学国家重点实验室
作者单位1.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China;
推荐引用方式
GB/T 7714		 Song QY,Sun CQ,Song QY,et al. Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,2020,771:9.
APA 宋清源,孙承奇,Song QY,&Sun CQ.(2020).Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime.MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING,771,9.
MLA 宋清源,et al."Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime".MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING 771(2020):9.

入库方式： OAI收割

来源：力学研究所

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