| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
High Performance Steels
|
| Presentation Title |
Zn Segregation at Grain Boundaries during Liquid Metal Embrittlement in the Fe-Zn System |
| Author(s) |
Yuki Ikeda, Hsu-Chih Ni, Theophilus Wallis, Anirban Chakraborty, Hassan Ghassemi-Armaki, Jian-Min Zuo, Reza Darvishi Kamachali, Robert Maass |
| On-Site Speaker (Planned) |
Yuki Ikeda |
| Abstract Scope |
Liquid-metal embrittlement (LME) by Zinc (Zn) is a prominent cause of early failure for advanced high-strength steels (AHSSs). To uncover the fundamental origins of this failure mode has been a challenge due to the fast, localized, and high-temperature process. Instead, a phenomenological understanding based on LME-crack studies has been a focus. To assess and quantify the first microstructural mechanisms during LME, we pursue here interrupted welding of a galvanized AHSS and focus on the evolution of the grain-boundary (GB) structure using scanning transmission electron microscope (Mat. Tod. Adv. 13 (2022) 100196). 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, we reveal how even small amounts of Zn can trigger significant segregation and drive intermetallic phase formation, which finds its origin in a segregation transition of the Fe-Zn couple. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Iron and Steel, Phase Transformations, Modeling and Simulation |