金属材料の耐水素脆化特性と表面酸化膜構造の関係解明

Material type: 文書・図像類

Author: 伊藤,, 吾朗ほか

Publisher: 茨城大学工学部

Publication date: 2016-06-24

Material Format: Digital

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Note (General)：: application/pdf研究報告書研究成果の概要（和文）：フェライト系鋼について、表面酸化膜が水素放出の大きな障害にならないことが分かった。一方、Al-9%Mg合金で、引張変形に伴って、粒内のすべり帯とともに一部の粒界上から水素の放出が観察された。水素が放出される粒界では、それに隣接する粒...

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Material Type: 文書・図像類
Title: 金属材料の耐水素脆化特性と表面酸化膜構造の関係解明
Author/Editor: 伊藤,, 吾朗
ITOH,, Goroh
Author Heading: 伊藤,, 吾朗
ITOH,, Goroh
Publication, Distribution, etc.: 茨城大学工学部
Publication Date: 2016-06-24
Publication Date (W3CDTF): 2016-06-24
Alternative Title: Elucidation of the relationship between resistance to hydrogen embrittlement and the structure of surface oxide film
Text Language Code: jpn
Target Audience: 一般
Note (General): application/pdf
研究報告書
研究成果の概要（和文）：フェライト系鋼について、表面酸化膜が水素放出の大きな障害にならないことが分かった。一方、Al-9%Mg合金で、引張変形に伴って、粒内のすべり帯とともに一部の粒界上から水素の放出が観察された。水素が放出される粒界では、それに隣接する粒内のすべりによる水素の移動、粒内すべり変形による段差の形成、酸化被膜の破壊を経て、水素が放出されると考えられた。Al-Zn-Mg合金でも上記と同様の結果を得たが、Al-Mg合金と異なり、PFZが存在することで、粒界近傍に変形が集中するため、より多くの粒界においても水素が放出された。以上により水素侵入・放出における緻密な酸化皮膜の役割が明らかになった。研究成果の概要（英文）：In ferritic steels, it was found that the surface oxide film is not a crucial barrier for hydrogen emission. In an Al-9%Mg alloy, hydrogen emission was observed in some of the grain boundaries as well as slip bands when specimen was deformed in tension. At the grain boundaries where hydrogen was emitted, it was presumed that the hydrogen was transported with slipping in a neighboring grain, with a formation of the surface step causing the fracture of the surface oxide film, and then emitted. In an Al-Zn-Mg alloy, similar result was obtained but the deformation was localized near the grain boundaries because of the presence of the precipitate free zones, and hence hydrogen was emitted at grain boundaries with more variety. Therefore, it was concluded that the surface oxide film plays an important role in hydrogen intrusion and emission.
DOI: 10.34405/00018162
Access Restrictions: 限定公開
Data Provider (Database): 国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
https://irdb.nii.ac.jp
Original Data Provider (Database): 茨城大学 : 茨城大学学術情報リポジトリ