|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||High Performance Steels
||Microstructure Evolution and Zinc Infiltration in an Advanced High-strength-Steel during Liquid-metal Embrittlement
||Yuki Ikeda, Hsu-Chih Ni, Anirban Chakraborty, Hassan Ghassemi-Armaki, Jian-Min Zuo, Reza Darvishi Kamachali, Robert Maaß
|On-Site Speaker (Planned)
Despite the excellent mechanical properties and corrosion resistance of 3rd generation Zinc (Zn) galvanized advanced high-strength streels (3rd Gen. AHSS), liquid-metal embrittlement (LME) causes early failure. The origin of LME is linked to Zn penetrating into the grain-boundary (GB) network during joining, such as resistivity spot welding (RSW). However, the fundamentals of LME remain poorly understood. Due to the presence of several phases, including ferrite and austenite, complicated microstructural changes and Zn transport mechanism are expected due to the different chemical affinity of ferrite and austenite for Zn when heating exceeds the Ac3 temperature during RSW. Here we continue our work on tracking LME (Materials Today Advances 13, 100196, 2022) and the associated microstructural evolution in a 3rd generation AHSS. We use transmission electron microscopy (TEM) and 4D-Scanning TEM to identify the early stages of LME prior to cracking during interrupted welding. Thermodynamic simulations complement our experimental observations.
||Iron and Steel, Characterization, Phase Transformations