Structural Changes in Galvannealed Coating during Hot-stamping Heating

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  • Sengoku Akihiro
    Nagoya R&D, Nippon Steel & Sumitomo Metal Corporation Department of Material Science and Engineering, Kyoto University
  • Takebayashi Hiroshi
    Nagoya R&D, Nippon Steel & Sumitomo Metal Corporation
  • Okamoto Norihiko
    Department of Material Science and Engineering, Kyoto University
  • Inui Haruyuki
    Department of Material Science and Engineering, Kyoto University

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Other Title
  • ホットスタンプ加熱過程における合金化溶融亜鉛めっき構造の変化
  • ホットスタンプ カネツ カテイ ニ オケル ゴウキンカ ヨウユウ アエンメッキ コウゾウ ノ ヘンカ

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Abstract

<p>Hot-stamping process is widely applied to coated steel sheets including galvannealed steel sheets (GA) to produce high-strength automobile components. In this study, we investigated the structural changes in galvannealed coating during hot-stamping heating. It was revealed that the original δ1 phase decomposed to the Γ phase and Zn liquid above the peritectic temperature of the δ1 phase, then the Γ phase further decomposed to the Fe-Zn solid-solution and Zn liquid above the peritectic temperature of the Γ phase, and finally the coating changed to a single phase of the Fe-Zn solid-solution. The series of structural changes in GA coating can be explained with the Fe-Zn binary phase diagram.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 104 (6), 331-337, 2018

    The Iron and Steel Institute of Japan

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