Multi-Modal 3D Image-Based Simulation of Hydrogen Embrittlement Crack Initiation in Al-Zn-Mg Alloy
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- Higa Ryota
- Graduate Course in Mechanical Engineering, Kyushu University
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- Fujihara Hiro
- Department of Mechanical Engineering, Kyushu University
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- Toda Hiroyuki
- Department of Mechanical Engineering, Kyushu University
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- Kobayashi Masakazu
- Department of Mechanical Engineering, Toyohashi University of Technology
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- Ebihara Kenichi
- Center for Computational Science & e-Systems, Japan Atomic Energy Agency
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- Takeuchi Akihisa
- Japan Synchrotron Radiation Research Institute
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説明
<p>In Al-Zn-Mg alloy, hydrogen (H) leads remarkably to the degradation of mechanical properties. It is indispensable to suppress this phenomenon called hydrogen embrittlement (HE) for developing the high-strength Al-Zn-Mg alloy. Because intergranular fracture (IGF) is mainly observed when HE occurs in the alloy, we need to understand the initiation behavior of IGF in order to suppress HE. Heterogeneous distribution of stress, strain and H concentration usually influence the IGF initiation in polycrystalline material. In the present study, we investigated distribution of stress, strain, and H concentration in actual fractured regions by simulation employing a crystal plasticity finite element method and H diffusion analysis in a 3D image-based model, which was created based on 3D polycrystalline microstructure data obtained from X-ray imaging technique. Combining the simulation and in-situ observation of the tensile test sample by X-ray CT, we examined the distribution of stress, strain, and H concentration in actual crack initiation behavior. Based on this, the condition for intergranular crack initiation were discussed. As a result, it is revealed that stress normal to grain boundary induced by crystal plasticity dominates intergranular crack initiation. In contrast, accumulation of internal H due to the stress has little impact on crack initiation.</p><p> </p><p>This Paper was Originally Published in Japanese in J. JILM 73 (2023) 530–536. Abstract was slightly modified.</p>
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 65 (8), 899-906, 2024-08-01
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390019457532331776
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- HANDLE
- 2324/7234369
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- NDL書誌ID
- 033628656
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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
- IRDB
- NDL
- Crossref
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- 抄録ライセンスフラグ
- 使用不可