Multiphase Numerical Simulations of Binary Alloy Lamellar Eutectoid Growth

Abstract

Based on the KKSO model [1], phase field and solute field are coupled to simulate the growth of lamellar pearlite in eutectoid transformation of Fe-C binary alloy. The influence of interface energy and diffusion coefficient on the microstructure and growth morphology of lamellar pearlite is studied. The results show that eutectoid lamellar morphology changed from regular symmetry to low symmetry and small amplitude oscillation, the growth rate of lamellar pearlite microstructure decreases and the morphology of ferrit phase interface frontier is changed from horizontal to convex with the increase of interfacial energy. With the increase of diffusion coefficient, the growth rate of lamellar pearlite microstructure increases and the morphology of pearlite interface frontier has no obvious change.