| About this Abstract |
| Meeting |
2024 AWS Professional Program
|
| Symposium
|
2024 AWS Professional Program
|
| Presentation Title |
The Effects of Substrate Aluminum Content on Liquid Metal Embrittlement Susceptibility of Resistance Spot Welds in Galvanized 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 and increase crashworthiness of 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. In this work, we seek to understand the effects of aluminum substrate content on LME susceptibility of 3rd Gen AHSS by analyzing mechanical behavior and coating-substrate interactions under elevated temperature tensile testing and relevant spot welding conditions. Hot tension test results on 0.5Si-0.05Al and 0.5Si-1.38Al alloys indicate that the 1.38Al alloy exhibited lower ductility loss and plastic strain energy loss. Diffusion simulation results suggest that aluminum enrichment may occur at the coating-substrate interface that stabilizes the beneficial Γ-Fe3Zn7 phase at the expense of the deleterious liquid phase. An increase in substrate aluminum content led to a decrease in solubility and diffusivity of zinc in the substrate, resulting in a decrease in the flux of zinc into the substrate, and thus, less embrittlement. Additional RSW testing was conducted on the two alloys to assess the applicability of the hot-tension test and simulation results to actual spot welding conditions. The results of this work are expected to provide insight into designing more LME resistant 3rd Gen AHSS for lightweight automotive applications. |
| Proceedings Inclusion? |
Undecided |