ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Welding and Joining
Fusion Zone Microstructural Evolution of Al-10% Si Coated Hot Stamping Steel during Laser Welding
Chang Wook LeeSo Youn KimSoon Geun JangGa Young ShinJi Hong Yoo
Author information
JOURNALS OPEN ACCESS FULL-TEXT HTML

2019 Volume 59 Issue 1 Pages 136-143

Details
Abstract

Fusion zone microstructural evolution of Al-10% Si coated hot stamping steel during laser welding and its mechanical properties were investigated in this study. During laser welding, a liquidized Al-10% Si coating penetrated along the fusion boundary to form δ-ferrite. After hot stamping heat treatment, the final microstructure was composed of a martensite-ferrite dual phase. The dual phase formation causes mixed mode fracture (brittle fracture + ductile fracture) at the fusion zone due to the hardness difference between the martensite and ferrite phases. This issue can be addressed by applying filler wire or by changing the coating system from an Al-based coating to a Zn-based coating.

Information related to the author
© 2019 by The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top