About this Abstract |
| Meeting |
MS&T26: Materials Science & Technology
|
| Symposium
|
Advances in Zinc-Coated Sheet Steel Processing and Properties
|
| Presentation Title |
Intermetallic Grain-Boundary Precipitation-Induced Liquid Metal Embrittlement Below the Ductility Trough |
| Author(s) |
Robert Maass, Seungchang Han, Yuki Ikeda, Amlan Das |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
Liquid metal embrittlement (LME) is a long-standing degradation phenomenon in which Zn infiltrates a susceptible steel substrate and promotes fracture. Novel galvanized advanced high-strength steels for the automotive sector reveal high LME susceptibility, renewing interest in understanding the LME phenomenon. Focusing on Zn-decorated but uncracked grain boundaries, we demonstrated how the early-stages of LME in steels can be linked intermetallic grain-boundary precipitation (Mat. Tod. Adv. 13 (2022) 100196). This mechanism is promoted by a strong segregation transition of the Fe-Zn system (Scripta Materialia 238 (2024) 115758), also present at temperatures below the ductility trough (Acta Mater. 259 (2023) 119243). Here, we transfer our nanoscale insights to the mechanical bulk response. We use synchrotron x-ray diffraction and demonstrate that the observed grain-boundary precipitation already occurs at temperature well below the ductility trough, indicating that liquid Zn is not required to observe the embrittling mechanisms associated with LME. |