Simulation of Morphologies in Solidification Microstructure and Residual Liquid by Multi-Phase Field Method

Abstract

The effect of microstructural morphologies on solidification microsegregation and residual liquid distribution was investigated in Fe-Cr-Ni-C alloy, which forms the basis for austenitic stainless steel with fully γ solidification mode by using the multi-phase field (MPF) method. When the cellular dendrite growth direction became inclined, the growth of the secondary arm became remarkable in the branching part and liquid droplets were formed irregularly around the grain boundary region. A liquid film was formed in the blocking part of inclined cellular growth, where stress concentration occurred continuously. This liquid film can influence solidification cracking susceptibility. Stress concentration occurred discontinuously in the branching part. The effect of varying the interface energy during solidification on the residual liquid morphology was not large, even when 2σ L-γ ≪ σ γγ , where σLγ is the interface energy of liquid/γ and σ γγ is the interface energy of γ/γ.