Void Formation by Cementite and Local Misorientation Evaluation during Tensile Deformation in High Strength Steel Sheets

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  • Maeda Mari
    Graduate School of Fundamental Science and Engineering, Waseda University
  • Shimamura Junji
    Steel Research Laboratory, JFE Steel Corporation
  • Suzuki Shinsuke
    Department of Applied Mechanics and Aerospace Engineering, Faculty of Fundamental Science and Engineering, Waseda University Kagami Memorial Research Institute for Materials Science and Technology

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Other Title
  • 高張力鋼板の引張変形時におけるセメンタイトによるボイド形成と局所方位差評価
  • コウチョウリョク コウバン ノ ヒッパリ ヘンケイジ ニ オケル セメンタイト ニ ヨル ボイド ケイセイ ト キョクショ ホウイサ ヒョウカ

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Abstract

<p>Voids formation by cementite was investigated quantitatively in high strength steel sheets consisting of bainitic ferrite and cementite. Tensile tests were performed with rectangular specimen in longitudinal direction to rolling direction. After the tensile tests, the fractured specimens were cut along the width center. The cross sections near the fractured surface were observed by SEM. Voids and microstructure were observed in five thickness reduction areas with different strain level. As a result, number density of voids increased as strain increased. Not only the number of short voids observed in low strain but also the number of long voids increased as strain increased. Mainly, two types of voids were seen here. One was decohesion of interface 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.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 103 (8), 483-490, 2017

    The Iron and Steel Institute of Japan

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