| About this Abstract |
| Meeting |
Materials Science & Technology 2020
|
| Symposium
|
Advances in Zinc-coated Sheet Steel Processing and Properties
|
| Presentation Title |
Role of Liquid Zn and α-Fe(Zn) on Liquid Metal Embrittlement Cracking of Resistance Spot Welded Medium Mn Steels |
| Author(s) |
Yeongdo Park, Siva Prasad Murugan, Ji-Ung Kim, Junsu Kim, Ilguk Jo |
| On-Site Speaker (Planned) |
Yeongdo Park |
| Abstract Scope |
Zn assisted liquid metal embrittlement (LME) demands investigations on the influence of Fe-Zn interaction and resulting phase composition on LME behavior. Therefore, this research aims to derive the correlation between microstructural changes such as α-Fe (Zn) and the liquid zinc fraction and LME cracks that appear during resistance spot welding of galvanized medium manganese steel. The results indicate that the LME cracking behavior during resistance spot welding was governed by the fraction of effective liquid Zn, which was a consequence of isothermal solidification owing to the thermodynamic stability of liquid Zn, the diffusivity of Zn in Fe and partitioning coefficient of liquid Zn. Moreover, LME was influenced by the breaking of α-Fe(Zn) layer, which directs the liquid Zn into the substrate steel in the welds. |