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The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels
Hong YS(洪友士); Liu XL(刘小龙); Lei ZQ(雷铮强); Sun CQ(孙成奇); Hong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Source PublicationINTERNATIONAL JOURNAL OF FATIGUE
2016
Volume89Pages:108-118
ISSN0142-1123
Abstract

For high-strength steels, the crack initiation of very-high-cycle fatigue (VHCF) is commonly at the interior of material with fish-eye (FiE) morphology containing a fine-granular-area (FGA) surrounding an inclusion as crack origin, and FGA is regarded as the characteristic region of crack initiation. Here, we carefully examined the micro-morphology of FGA and FiE for two high-strength steels. The results revealed that the microscopic nature of FGA is a thin layer of nanograins. Then we proposed the formation mechanism of FGA: Numerous Cyclic Pressing (NCP) between originated crack surfaces, which causes grain refinement at originated crack wake and therefore the formation of FGA. The results of second set experiment showed that the cases with negative stress ratios exhibit the prevalence of nanograin layer in FGA region and the nanograin layer vanishes for the cases with positive stress ratios, which is a verification of the proposed NCP model. (C) 2015 Elsevier Ltd. All rights reserved.

DOI10.1016/j.ijfatigue.2015.11.029
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000377839100012
WOS KeywordVery-high-cycle fatigue; Fatigue crack initiation; Fine-granular-area; Nanograins; High-strength steels;CHROMIUM-BEARING STEEL; LONG-LIFE FATIGUE; N-GREATER-THAN-10(7) CYCLES; RESIDUAL-STRESSES; VHCF-REGIME; BEHAVIOR; INCLUSIONS; PROPAGATION; DAMAGE; SIZE
WOS Research AreaEngineering ; Materials Science
WOS SubjectEngineering, Mechanical ; Materials Science, Multidisciplinary
Funding OrganizationThe authors would like to acknowledge the financial supports from the National Basic Research Program of China (2012CB937500) and from the National Natural Science Foundation of China (11572325).
DepartmentLNM金属材料微结构与力学性能
Classification一类
RankingTrue
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Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/59536
Collection非线性力学国家重点实验室
Corresponding AuthorHong, YS (reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Hong YS,Liu XL,Lei ZQ,et al. The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels[J]. INTERNATIONAL JOURNAL OF FATIGUE,2016,89:108-118.
APA Hong YS,Liu XL,Lei ZQ,Sun CQ,&Hong, YS .(2016).The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels.INTERNATIONAL JOURNAL OF FATIGUE,89,108-118.
MLA Hong YS,et al."The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels".INTERNATIONAL JOURNAL OF FATIGUE 89(2016):108-118.
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