About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
|
Advances in Ferrous Metallurgy
|
Presentation Title |
Segregation-induced Transition during Early Stages of Liquid-metal Embrittlement in an Advanced High-strength Steel |
Author(s) |
Yuki Ikeda, Hsu-Chih Ni, Hassan Ghassemi-Armaki, Anirban Chakraborty, Jim Zuo, Reza Darvishi-Kamachali, Robert Maass |
On-Site Speaker (Planned) |
Robert Maass |
Abstract Scope |
One contribution of materials science to energy efficiency is the continuous development of novel high-performance structural materials, such as advanced high-strength steels (AHSSs). To protect such advanced alloys from property degradation via corrosion, zinc (Zn) coatings are often applied. Whilst protective, a Zn-coating comes with problems – the AHSS substrate becomes susceptible for liquid-metal embrittlement (LME) that can be the origin of significant mechanical property degradation when Zn infiltrates into the steel substrate. Building on our earlier work of a fully welded microstructure (Materials Today Advances 13, 100196, 2022), we focus here on non-cracked environments during interrupted spot-welding to capture the initial stages of Zn penetration. In concert with thermodynamic calculations, we demonstrate and rationalize low temperature precipitation of intermetallic phases due to a segregation-inducted transition. The time-resolved substructure evolution suggest that these initial precipitation sites are linked to first micro-crack initiation. |