Improvement in punching properties of high tensile strength steel sheet by heat-treatments for reduction of center segregation

Kota Sakumoto, Kazuhiko Yamazaki, Takashi Kobayashi, Shinsuke Suzuki

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

    2 Citations (Scopus)

    Abstract

    We investigated punching properties (crack in punched surface and hole expansion ratio) of high tensile strength steel sheets with and without center segregation. High strength steel sheets were heat-treated to reduce center segregation. Tensile strength, shear surface ratio, depth of rollover and burr height were measured on heat-treated steel sheets to confirm the effect of heat-treatment on strength. The EPMA analysis showed that the center segregation of Mn was reduced by the diffusion during heat-treatment. Crack-formation frequency and hole expansion ratio were also measured. As a result, the center segregation of Mn in high tensile strength steel sheets decreased by the heat-treatment (600 deg;C for 100 h) with maintaining the tensile strength, the depth of rollover and the burr height. The crack-formation frequency of the steel sheets decreased through heat-treatments.

    Original languageEnglish
    Title of host publicationKey Engineering Materials
    PublisherTrans Tech Publications Ltd
    Pages1075-1080
    Number of pages6
    Volume622-623
    ISBN (Print)9783038351931
    DOIs
    Publication statusPublished - 2014
    Event15th International Conference on Metal Forming 2014 - Palermo
    Duration: 2014 Sep 212014 Sep 24

    Publication series

    NameKey Engineering Materials
    Volume622-623
    ISSN (Print)10139826

    Other

    Other15th International Conference on Metal Forming 2014
    CityPalermo
    Period14/9/2114/9/24

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    Keywords

    • Center segregation
    • High tensile steel sheet
    • Hole expansion ratio
    • Punching

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering

    Cite this

    Sakumoto, K., Yamazaki, K., Kobayashi, T., & Suzuki, S. (2014). Improvement in punching properties of high tensile strength steel sheet by heat-treatments for reduction of center segregation. In Key Engineering Materials (Vol. 622-623, pp. 1075-1080). (Key Engineering Materials; Vol. 622-623). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/KEM.622-623.1075