The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels | |
Hong YS(洪友士)![]() ![]() ![]() | |
Source Publication | INTERNATIONAL JOURNAL OF FATIGUE
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2016 | |
Volume | 89Pages:108-118 |
ISSN | 0142-1123 |
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. |
DOI | 10.1016/j.ijfatigue.2015.11.029 |
URL | 查看原文 |
Indexed By | SCI ; EI |
Language | 英语 |
WOS ID | WOS:000377839100012 |
WOS Keyword | Very-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 Area | Engineering ; Materials Science |
WOS Subject | Engineering, Mechanical ; Materials Science, Multidisciplinary |
Funding Organization | The 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). |
Department | LNM金属材料微结构与力学性能 |
Classification | 一类 |
Ranking | True |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://dspace.imech.ac.cn/handle/311007/59536 |
Collection | 非线性力学国家重点实验室 |
Corresponding Author | Hong, 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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