Investigation of hydrogen embrittlement characteristics of strech-formed steel based on stress, strain, hydrogen diffusion distribution analysis

2023 Fiscal Year Final Research Report

• Project/Area Number: 22K14497
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 26040:Structural materials and functional materials-related
• Research Institution: Tohoku University
• Principal Investigator: Ajito Saya 東北大学, 金属材料研究所, 助教 (20903834)
• Project Period (FY): 2022-04-01 – 2024-03-31
• Keywords: 鉄鋼材料 / 水素脆化 / 水素可視化 / プレス成形

Outline of Final Research Achievements

In order to elucidate the hydrogen embrittlement characteristics of press-forming steel sheets, a hydrogen visualization technique that can applied to specimens with uneven surfaces was developed. The Ir complex film was formed on the specimen surfaces by a spray method and the hydrogen diffusion behavior in the stretch-formed specimen was analyzed using the color change of the Ir complex upon reaction with hydrogen. The distribution of hydrogen diffusion behavior corresponding to the plastic strain introduced into the stretch-formed specimen was successfully analyzed.

Free Research Field

腐食科学

Academic Significance and Societal Importance of the Research Achievements

本研究では、凹凸のある試験片へ適用可能な水素可視化法の開発に成功した。この水素可視化法を用いることで、プレス成形鋼板のような実用部材について水素脆化割れの影響因子の一つである水素拡散挙動解析が可能となる。その結果、プレス成形を施された鉄鋼材料の水素脆化特性の解明や水素脆化割れしにくい材料開発への貢献が期待される。