| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Advances in Metallic Coated Advanced Steels
|
| Presentation Title |
Grain-Boundary Precipitation as a Mechanism of Liquid-Metal Embrittlement in Advanced High-Strength Steels |
| Author(s) |
Yuki Ikeda, Anirban Chakraborty, Reza Darvishi-Kamachali, Hassan Ghassemi-Armaki, Jim Zuo, Robert Maass |
| On-Site Speaker (Planned) |
Robert Maass |
| Abstract Scope |
Liquid-metal embrittlement (LME) by Zinc (Zn) is a prominent cause for failure of advanced high-strength steels (AHSSs), and to uncover its origin has been a long-standing challenge. We pursue here interrupted welding of a galvanized AHSS and focus on the evolution of the grain-boundary structure using scanning transmission electron microscope (Mat. Tod. Adv. 13 (2022) 100196), to assess and quantify the first microstructural mechanisms during the early stages of LME. At temperatures well below the ductility trough, significant Zn enrichment and GB phase formation is observed. In concert with CALPHAD-integrated density-based phase field modeling (Scripta Materialia 238 (2024) 115758), we reveal how even small amounts of Zn can segregate and drive intermetallic phase formation, which finds its origin in a segregation transition of the Fe-Zn couple (Acta Materialia 259 (2023) 119243). These findings show how phase precipitation drives grain-boundary weakening at temperatures below the ductility trough. |