Modeling Segregation of Fe–C Alloy in Solidification by Phase-Field Method Coupled with Thermodynamics

The primary carbide in high carbon chromium bearing steels, which arises from solute segregation during non-equilibrium solidification, is one of the key factors affecting mechanical properties and performance related components. In this work, effects forming element diffusion, austenite grain size, cooling rate on precipitation solidification an Fe–C binary alloy were studied by phase-field method coupled with a thermodynamic database. It was clarified that increasing ratio diffusivity solid liquid, refining size to lower than critical value, can reduce at late solidification. Two characteristic parameters introduced quantitatively evaluate including phase fraction threshold when concentration liquid reaches eutectic composition, maximum ratio. Both be well-correlated austenite, rate, provides potential ways control steels.