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Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime
Song QY(宋清源)1,2; Sun CQ(孙成奇)1,2
Source PublicationMATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
2020-01-13
Volume771Pages:9
ISSN0921-5093
Abstract

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.

Keywordvery high cycle fatigue High strength steels Crack initiation mechanism crack growth rate Grain refinement
DOI10.1016/j.msea.2019.138648
Indexed BySCI ; EI
Language英语
WOS IDWOS:000503324700046
WOS KeywordFRACTURE SURFACE ; BEARING STEEL ; STRESS RATIO ; LIFE ; PROPAGATION ; BEHAVIOR ; INCLUSION ; FAILURE ; SIZE ; AREA
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding ProjectNational 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]
Funding OrganizationNational Key R&D Program of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences
Classification一类
Ranking1
ContributorSun, Chengqi
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/81275
Collection非线性力学国家重点实验室
Affiliation1.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
Recommended Citation
GB/T 7714
Song QY,Sun CQ. 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 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 Song QY,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.
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