|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||High Performance Steels
||Design and Challenge of Cold-rolled Dual-phase Steel Strengthened by Interphase Precipitation
||Shao-Lun Lu, Kuo-Cheng Yang, Ching-Yuan Huang, Hung-Wei Yen
|On-Site Speaker (Planned)
In this work, design of cold-rolled dual-phase (DP) steel with interphase precipitation via CALPHAD is demonstrated. Coarsening of carbides is the primary barrier for production of cold-rolled DP steel with nanometer-sized carbides. We design a novel process of DP steel to dissolve carbides and form interphase-precipitated carbide in the annealing, enabling strengthening of ferrite by nanometer-sized carbides. Besides, phase transformation characteristics at various temperatures were determined by thermodynamics. Distribution of nanometer-sized carbides was investigated by using transmission electron microscopy. Contributed strength from carbides was evaluated by hardness test. Although alloy design by CALPHAD solves coarsening issue, it is interesting that banded structure due to segregation appears to be the new challenge. In summary, this study delivers discussion on the solved and unsolved issues in design of cold-rolled dual-phase (DP) steel with nanometer-sized carbides.
||Iron and Steel, Phase Transformations,