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

Toshihito Omi, Toshimitsu Yokobori, Kenichi Takei, Yuki Konishi

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    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.

    Original languageEnglish
    Title of host publicationMaterials and Fabrication
    PublisherAmerican Society of Mechanical Engineers (ASME)
    ISBN (Electronic)9780791846049
    DOIs
    Publication statusPublished - 2014 Jan 1
    EventASME 2014 Pressure Vessels and Piping Conference, PVP 2014 - Anaheim, United States
    Duration: 2014 Jul 202014 Jul 24

    Publication series

    NameAmerican Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
    Volume6B
    ISSN (Print)0277-027X

    Other

    OtherASME 2014 Pressure Vessels and Piping Conference, PVP 2014
    CountryUnited States
    CityAnaheim
    Period14/7/2014/7/24

    ASJC Scopus subject areas

    • Mechanical Engineering

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  • Cite this

    Omi, T., Yokobori, T., Takei, K., & Konishi, Y. (2014). The analysis of hydrogen diffusion behaviors coupled with the analysis of heat transfer around the heat affected zone of welding. In Materials and Fabrication (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 6B). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2014-28584