Effect of cementite on ductile fracture in high tensile strength steel sheets

Mari Maeda, Junji Shimamura, Shinsuke Suzuki

    研究成果: Conference contribution

    抄録

    In this study, voids formation behavior was investigated quantitatively in high tensile strength steel sheets containing cementite. Tensile tests of rectangular specimen were performed in longitudinal direction, and after the tensile tests, the fractured specimens were observed by SEM in the center position of longitudinal cross section. Voids were observed in five thickness reduction areas with different strain level. As a result, number density of voids increased as strain increased. Mainly, two types of voids were seen here. One was the decohesion at the boundaries between bainitic ferrite and cementite, and the other was cracking of cementite itself. Misorientation in the crystal grains was determined by KAM (Kernel Average Misorientation) using EBSD analysis. The obtained KAM values increased as strain increased, especially in the boundaries between bainitic ferrite and cementite. Therefore, it was revealed quantitatively that voids formed mainly through local strain increase in the boundaries between bainitic ferrite and cementite.

    本文言語English
    ホスト出版物のタイトルMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
    出版社Association for Iron and Steel Technology, AISTECH
    ページ573-577
    ページ数5
    1
    ISBN(電子版)9781510833142
    出版ステータスPublished - 2016
    イベントMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States
    継続期間: 2016 10 232016 10 27

    Other

    OtherMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
    国/地域United States
    CitySalt Lake City
    Period16/10/2316/10/27

    ASJC Scopus subject areas

    • 材料科学(その他)
    • 材料力学
    • エネルギー工学および電力技術

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