| Project/Area Number |
22K18763
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
Komoda Ryosuke 九州工業大学, 大学院工学研究院, 准教授 (90801308)
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| Project Period (FY) |
2022-06-30 – 2025-03-31
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| Project Status |
Completed (Fiscal Year 2024)
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| Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
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| Keywords | 水素脆化 / 水素侵入 / 電子密度 / 静電誘導 / 水素ぜい化 |
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| Outline of Research at the Start |
本研究では水素脆化をコントロールする新たな手法として，材料表面の電子密度の制御によって材料表面での水素分子の解離反応をコントロールする手法を提案する．まず，試験片表面の電子密度を制御可能な水素ガス環境中材料試験方法の開発を行い，材料表面の電子密度が水素脆化挙動に影響を及ぼすことを実験的に証明する．さらに，電子密度が水素脆化に及ぼす影響に対する諸因子の影響（ガス圧力，材料，荷重条件など）を評価し，現象の理解を深める．
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| Outline of Final Research Achievements |
To induce hydrogen embrittlement (HE) in a hydrogen gas environment, electron transfer (catalytic action) between hydrogen molecules and the material surface is required. Therefore, if this electron transfer can be controlled, mitigation of hydrogen embrittlement becomes feasible.In this study, we attempted to control hydrogen embrittlement under hydrogen gas conditions by modulating the electron density at the material surface.
We developed a novel tensile testing apparatus capable of controlling surface electron density via an applied electric field under a hydrogen atmosphere. The specimen was placed between two electrodes, and surface electron density was adjusted through electrostatic induction. The maximum electric field strength was set to 1200 kV/m, and the hydrogen gas pressure was 1.0 MPa. SENT specimens were used.
The test results demonstrated that the application of an electric field, regardless of its polarity, effectively suppressed hydrogen embrittlement.
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| Academic Significance and Societal Importance of the Research Achievements |
本研研究によって，材料表面の電子密度が増加する場合も減少する場合も，水素脆化を抑制することを実験的に明らかにすることができた．この水素脆化の抑制効果を有効活用すれば，水素関連機器で生じる水素脆化を制御でき，機器の安全性の向上およびコスト低減に資することができる．
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