Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Surface Treatment and Corrosion
Structural Changes in Galvannealed Coating during Hot-stamping Heating
Akihiro SengokuHiroshi TakebayashiNorihiko OkamotoHaruyuki Inui
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2018 Volume 104 Issue 6 Pages 331-337

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Abstract

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.

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© 2018 The Iron and Steel Institute of Japan
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