Multi-probe Characterization of Hydrogen, Dislocation, and Damage: towards unraveling hydrogen embrittlement mechanism of advanced high strength steels
| Project/Area Number |
17H04956
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| Research Category |
Grant-in-Aid for Young Scientists (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Structural/Functional materials
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| Research Institution | Tohoku University (2019)
Kyushu University (2017-2018) |
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Principal Investigator |
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| Project Period (FY) |
2017-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥24,440,000 (Direct Cost: ¥18,800,000、Indirect Cost: ¥5,640,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2018: ¥3,380,000 (Direct Cost: ¥2,600,000、Indirect Cost: ¥780,000)
Fiscal Year 2017: ¥18,590,000 (Direct Cost: ¥14,300,000、Indirect Cost: ¥4,290,000)
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| Keywords | 水素脆化 / 電子チャネリング / 水素可視化 / 損傷発達 / 鉄鋼材料 / 転位運動 / その場観察 / 耐水素鋼 / 銀デコレーション / 複相鋼 / 材料強度 |
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| Outline of Final Research Achievements |
In this study, we were dedicated to develop the following three techniques: (1) development of hydrogen mapping technique, (2) statistical quantification of microstructural damage associated with hydrogen embrittlement, and (3) direct observation of hydrogen-dislocation interactions. Specifically, we could obtain the following achievements. For (1), we could develop spatially and kinetically resolved hydrogen mapping by using in situ silver decoration technique. For (2), the damage quantification analyses were coupled with vacancy density measurements. For (3), the dislocation-hydrogen interaction was successfully observed by in situ electron channeling contrast imaging (ECCI).
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| Academic Significance and Societal Importance of the Research Achievements |
本成果は、高強度鋼の遅れ破壊抑制や、水素エネルギー用インフラ構造材料開発のための指針構築に寄与する。今回開発した手法はいずれも特殊な装置を必要とするものではなく、また試験片形状や対象材料の自由度が大きい。つまり汎用的に利用される可能性が高い技術の構築に成功しているといえる。本研究にて示した解析法の詳細とともに、本手法を通して解明した先進高強度鋼の水素脆化機構も今後の耐水素鋼開発に役立つと考える。
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Report
(4 results)
Research Products
(53 results)
