鉄鋼のQ&Pプロセスにおける炭素分配のフェーズフィールドシミュレーション

抄録

In order to obtain precise knowledge on the carbon partitioning during quenching & partitioning (Q&P) process in steel, we simulated carbon diffusion in martensite-austenite two-phase microstructure in Fe-C steel based on the phase-field method. The initial two-phase microstructure was obtained in advance by a three-dimensional phase-field simulation of martensitic transformation. Then, using the simulated two-phase microstructure, the carbon diffusion was calculated without solving the time evolution of martensite-austenite microstructure. It was observed that carbon distributed heterogeneously in martensite phase before it diffused from martensite to austenite phases. It has been revealed that the elastic strain energy potential has a significant effect on the carbon diffusion in martensite phase.