| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Advances in Metallic Coated Advanced Steels
|
| Presentation Title |
Liquid Metal Embrittlement of 3rd Generation Advanced High Strength Steel Driven by Nano-intermetallic Phase Formation Along Grain Boundaries |
| Author(s) |
Yuki Ikeda, Anirban Chakraborty, Hassan Ghassemi-Armaki, Robert Maass |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
Despite the high strength and ductility of advanced high-strenght 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. |