Cracking Process in Delayed Fracture of High-Strength Steel after Long Atmospheric Exposure
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- Homma Tomoka
- Graduate School, Sophia University
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- Chiba Takahiro
- Graduate School, Sophia University
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- Takai Kenichi
- Department of Engineering and Applied Science, Sophia University
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- Akiyama Eiji
- Institute for Materials Research, Tohoku University
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- Oshikawa Wataru
- Faculty of Engineering, University of the Ryukyus
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- Nagumo Michihiko
- Laboratory for Materials Science and Technology, Waseda University
抄録
<p>This paper is the first microscopic observation of the entire cracking process in delayed fracture of high-strength steel bolt after long-term atmospheric exposure. A sufficiently fresh fracture surface exhibits the initiation of the propagating crack in a thin zone beneath the screw groove, resulting from the merging of multiple cracks nucleated therein. The fracture morphology is initially intergranular, exhibiting the three-dimensional shape of prior austenite grains, but the stress and strain states at the nucleation sites are not uniquely specified. The fracture morphology alters as the crack extends from intergranular to quasi-cleavage and fine dimples, associated with increasing stress intensity under a constant-displacement condition. The change from inter- to trans-granular fracture is continuous, implying affinity among different morphologies associated with the increased density and the distribution of potential crack nucleation sites in the crack front. The crack propagation in the quasi-cleavage and fine dimple regions is step-wise of about 50 µm per step. Recent studies about the function of hydrogen in embrittlement are referred to in respect of the accumulation of strain-induced damage. The enhanced generation of strain-induced vacancies is the presumable function of hydrogen compatible with the present findings.</p>
収録刊行物
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- ISIJ International
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ISIJ International 62 (4), 776-787, 2022-04-15
一般社団法人 日本鉄鋼協会
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詳細情報 詳細情報について
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- CRID
- 1390854882637688960
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- NII論文ID
- 130008159462
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- ISSN
- 13475460
- 09151559
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- 抄録ライセンスフラグ
- 使用不可