|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Early Stages of Liquid-metal Embrittlement in an Advanced High-strength Steel
||Yuki Ikeda, Renliang Yuan, Anirban Chakraborty, Hassan Ghassemi-Armaki , Jian-Min Zuo, Robert Maaß
|On-Site Speaker (Planned)
Despite the high strength and ductility of advanced high-strength streels (AHSS), the Zinc (Zn) coating typically applied to increase its corrosion resistance can be the origin of significant mechanical property degradation if, for example, joined with spot welding. This property degradation is a manifestation of the well-known Liquid Metal Embrittlement (LME) phenomena, during which liquified Zn infiltrates into the steel substrate along grain boundaries (GBs). In order to shed more light on the early stages of LME in AHSS, we pursue here the approach to study infiltrated but uncracked GBs. We use scanning transmission electron microscopy (STEM) to investigate these boundaries and conclude that prior to cracking nucleation and growth of intermetallic phases occurs inside the uncracked GBs. We discuss these findings in the context of resulting local strain heterogeneities that may eventually trigger microcracking in LME.
||Iron and Steel, Characterization,