TY - JOUR
T1 - Structural changes in galvannealed coating during hot-stamping heating
AU - Sengoku, Akihiro
AU - Takebayashi, Hiroshi
AU - Okamoto, Norihiko
AU - Inui, Haruyuki
N1 - Publisher Copyright:
© 2018 Iron and Steel Institute of Japan. All rights reserved.
Copyright:
Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2018/6
Y1 - 2018/6
N2 - 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.
AB - 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.
KW - Coating structure
KW - Fe-Zn solid-solution
KW - Galvannealed coating
KW - Hot-stamping
KW - Zn-Fe intermetallic compound
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U2 - 10.2355/tetsutohagane.TETSU-2017-100
DO - 10.2355/tetsutohagane.TETSU-2017-100
M3 - Article
AN - SCOPUS:85048032436
VL - 104
SP - 331
EP - 337
JO - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
JF - Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
SN - 0021-1575
IS - 6
ER -