Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Surface Treatment and Corrosion
Structural Change in Hot-Stamped GA Coating and Influence on Corrosion Resistance by Tempering
Akihiro SengokuHiroshi TakebayashiNorihiko OkamotoHaruyuki Inui
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2019 Volume 105 Issue 8 Pages 819-826

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Abstract

Hot-stamped galvannealed steel sheets (GA) are widely applied to produce automobile components that require high strength. The hot-stamped components tempered for the control of strength improve the collision property. This study investigated the structural changes in the hot-stamped GA coating and the influence on corrosion resistance by tempering. It has been revealed that by tempering between 500-600 degrees Celsius, the Fe-Zn solid-solution phase in the hot-stamped GA coating changed into two phases: the Γ phase and the Fe-Zn solid-solution phase with less Zn, and these changes in the coating structure improved the corrosion resistance. The phase decomposition is considered to result from discontinuous precipitation of the Fe-Zn supersaturated-solid-solution.

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© 2019 The Iron and Steel Institute of Japan
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