The formation mechanism of characteristic region at crack initiation for very-high-cycle fatigue of high-strength steels
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- 作者：Youshi Hong ; hongys@imech.ac.cn" class="auth_mail" title="E-mail the corresponding author ; Xiaolong Liu ; Zhengqiang Lei ; Chengqi Sun
- 关键词：Very-high-cycle fatigue ; Fatigue crack initiation ; Fine-granular-area ; Nanograins ; High-strength steels
- 刊名：International Journal of Fatigue
- 出版年：2016
- 出版时间：August 2016
- 年：2016
- 卷：89
- 期：Complete
- 页码：108-118
- 全文大小：3960 K
文摘
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FGA is a nanograin layer of 500–800 nm thick with grain size of 50 nm.
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Nanograin layer exists in both sides of fracture surface of FGA region.
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Nanograins form at crack wake via contacting between originated crack surfaces.
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Nanograins present for negative stress ratio cases, but vanish for R > 0 cases.
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Proposed Numerous Cyclic Pressing model explains FGA formation.
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