The analysis of hydrogen diffusion behaviors coupled with the analysis of heat transfer around the heat affected zone of welding

Toshihito Ohmi, Toshimitsu Yokobori, Kenichi Takei, Yuki Konishi

    研究成果: Conference contribution

    1 被引用数 (Scopus)

    抄録

    Hydrogen penetrates into the metal and causes Hydrogen embrittlement due to the increase in hydrogen concentration. This is caused by the local stress fields such as residual stress field at the site of welding or local stress field around a crack tip. It accompanied with incubation time of several hours since the components were exposed to hydrogen atmospheric condition. This incubation time is time lag of hydrogen diffusion and concentration at the site where the hydrogen embrittlement occurs. Therefore, clarification of the hydrogen diffusion behavior is important to prevent from fracture of hydrogen embrittlement. In this paper, the numerical analyses of hydrogen diffusion around weld part including HAZ (Heat Affected Zone) under residual stress coupled with that of heat transfer during the cooling process before and after weld were conducted and the behaviors of hydrogen concentration were analyzed. On the basis of these analyses, the method of heat treatment to prevent from hydrogen concentration at the weld part was investigated. Results obtained by these analyses showed that pre weld heat treatment is effective in the prevention of hydrogen concentration and combined pre weld heat treatment with post weld heat treatment was found to be the most effective treatment.

    本文言語English
    ホスト出版物のタイトルMaterials and Fabrication
    出版社American Society of Mechanical Engineers (ASME)
    ISBN(電子版)9780791846049
    DOI
    出版ステータスPublished - 2014
    イベントASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States
    継続期間: 2014 7 202014 7 24

    出版物シリーズ

    名前American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
    6B
    ISSN(印刷版)0277-027X

    Other

    OtherASME 2014 Pressure Vessels and Piping Conference, PVP 2014
    国/地域United States
    CityAnaheim
    Period14/7/2014/7/24

    ASJC Scopus subject areas

    • 機械工学

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