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

Mari Maeda, Junji Shimamura, Shinsuke Suzuki

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

    Abstract

    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.

    Original languageEnglish
    Title of host publicationMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016
    PublisherAssociation for Iron and Steel Technology, AISTECH
    Pages573-577
    Number of pages5
    Volume1
    ISBN (Electronic)9781510833142
    Publication statusPublished - 2016
    EventMaterials Science and Technology Conference and Exhibition 2016, MS and T 2016 - Salt Lake City, United States
    Duration: 2016 Oct 232016 Oct 27

    Other

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

    Keywords

    • Cementite
    • Ductile fracture
    • EBSD
    • High tensile strength steel sheet
    • KAM
    • Void

    ASJC Scopus subject areas

    • Materials Science (miscellaneous)
    • Mechanics of Materials
    • Energy Engineering and Power Technology

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