Articles techniques et présentations

The transformation of austenite (A) to ferrite (F) in steels, which is technologically important and of fundamental interest, still remains less well understood in some aspects. At intermediate undercooling F grows with a plate-like morphology (widmanstätten). Some calculations, which assume that the composition at A/F boundary is local-equilibrium or the morphology of F is rather simple, are just fit for low dimensional simple shape. The phase-field modeling (PFM) which is proposed to simulate complicated microstructure evolutions, is anther powerful method. A PFM with a highly anisotropic interfacial energy is formulated, and the governing equations are solved successfully by the commercial software COMSOL Multiphysics® software through the mode of self-definition partial differential equation. The simulated results have excellent similarity with experimentally observed ones.