| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Environmentally Assisted Cracking: Theory and Practice
|
| Presentation Title |
Micromechanisms Behind Liquid Metal Embrittlement in Galvanized TWIP Steel |
| Author(s) |
Virginia Bertolo, Roumen H Petrov, Vera Popovich |
| On-Site Speaker (Planned) |
Virginia Bertolo |
| Abstract Scope |
Liquid Metal Embrittlement (LME) creates obstacles to the use of advanced high-strength steels (AHSS) in the automotive industry. It is characterized by ductility loss of solid-liquid metal couples (e.g., Zn-galvanized steels) triggered by simultaneous action of high temperature and tensile stress, often happening during resistance spot welding – performed up to 5000 times per vehicle. To prevent or minimize the LME sensitivity of AHSS, a comprehensive understanding of the micromechanisms behind LME is required. However, they are not yet fully understood and existing theories are often contradictory. Therefore, this study aims to untangle the LME micromechanisms in Zn-galvanized TWIP steel. Gleeble hot tensile tests at 800 °C were performed and load-displacement curves were analyzed. Various stress levels in elastic and plastic regions were selected for further interrupted tests. These tests along with microscopic and chemical analysis of transverse fracture surfaces allowed us to identify some of the important LME micromechanisms. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Other, Other, Other |