| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced High Strength Steels IV
|
| Presentation Title |
J-5: Solutions to Hydrogen Embrittlement of Ultra-high Strength Press-hardened Steel for Automotive Application |
| Author(s) |
Lawrence Cho, P.E. Bradley, Matthew Connolly, M.L. Martin, D.S. Lauria, Frank W. Delrio, A.J. Slifka, E.J. Seo, K.R. Jo, S.W. Kim |
| On-Site Speaker (Planned) |
Lawrence Cho |
| Abstract Scope |
Improved safety standards and reduced automotive body-in-white weight have led to a strong interest in ultra-high strength press-hardened steels (PHS). However, the martensitic PHS is particularly sensitive to the hydrogen embrittlement. An atmospheric corrosion of the steel or Al-Si coating by water vapor in the furnace atmosphere of hot stamping lines produces hydrogen, leading to the hydrogen uptake of the steel. This hydrogen uptake causes a hydrogen-induced fracture of the PHS during tensile straining. The present contribution reports three methods to address the PHS hydrogen-induced fracture. The first method involves post-bake hardening treatment, which partially removes the diffusible hydrogen in the PHS. Second, use of Zn-coated steel for the hot stamping application reduces the risk of hydrogen embrittlement. Finally, vanadium additions into the steel composition cause an increased density of hydrogen-trapping sites and considerably reduce the negative impact of hydrogen uptake on the mechanical properties of the PHS. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |