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

DOI Web Site Web Site 被引用文献2件 参考文献16件
  • 前田 真利
    早稲田大学大学院基幹理工学研究科
  • 嶋村 純二
    JFEスチール(株)スチール研究所
  • 鈴木 進補
    早稲田大学基幹理工学部機械科学・航空学科 早稲田大学各務記念材料技術研究所

書誌事項

タイトル別名
  • Void Formation by Cementite and Local Misorientation Evaluation during Tensile Deformation in High Strength Steel Sheets
  • 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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抄録

<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>

収録刊行物

  • 鉄と鋼

    鉄と鋼 103 (8), 483-490, 2017

    一般社団法人 日本鉄鋼協会

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