Mechanism of crack initiation and early growth of high strength steels in very high cycle fatigue regime | |
Song QY(宋清源)1,2![]() ![]() | |
Source Publication | MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING (IF:4.081[JCR-2018],4.014[5-Year]) |
2020-01-13 | |
Volume | 771Pages:9 |
ISSN | 0921-5093 |
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. |
Keyword | very high cycle fatigue High strength steels Crack initiation mechanism crack growth rate Grain refinement |
DOI | 10.1016/j.msea.2019.138648 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000503324700046 |
WOS Keyword | FRACTURE SURFACE ; BEARING STEEL ; STRESS RATIO ; LIFE ; PROPAGATION ; BEHAVIOR ; INCLUSION ; FAILURE ; SIZE ; AREA |
WOS Research Area | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
WOS Subject | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
Funding Project | 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] |
Funding Organization | National 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 |
Ranking | 1 |
Contributor | 孙成奇 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/81275 |
Collection | 超常环境非线性力学全国重点实验室 |
Affiliation | 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 |
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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