About this Abstract |
Meeting |
MS&T23: Materials Science & Technology
|
Symposium
|
Advances in Ferrous Metallurgy
|
Presentation Title |
The Effects of Substrate Aluminum Content on Fe-Zn Intermetallic Reactions and Liquid Metal Embrittlement in Third Generation Advanced High Strength Steels |
Author(s) |
Jake Colburn, Jonah Klemm-Toole, John Speer |
On-Site Speaker (Planned) |
Jake Colburn |
Abstract Scope |
The desire to further lightweight vehicles by implementing Third Generation Advanced High Strength Steels (3rd Gen AHSS) in automotive bodies has been hindered by the phenomenon of liquid metal embrittlement (LME) during resistance spot welding (RSW) of these zinc-coated steels. This work, therefore, seeks to understand the effects that aluminum substrate content has on LME susceptibility of 3rd Gen AHSS by analyzing the effects of aluminum on the coating-substrate interactions under spot welding conditions. Hot tension test results indicate that a 0.5 wt% Al alloy shows the highest remaining plastic energy to fracture in the coated condition. Thermodynamic and kinetic simulation results suggest that at intermediate substrate aluminum contents of 0.5 wt%, less liquid Zn may be available for substrate embrittlement due to increased Fe-Zn intermetallic stability. At lower (0.05 wt%) and higher (1.38 wt%) aluminum contents the Fe-Zn intermetallic stability is decreased and liquid available for embrittlement is increased. |