Application of phase field analysis for predicting solidificationmicrostructure in laser power bed fusion

A comprehensive numerical model is developed to predict solidification microstructures in the additivemanufacturing laser powder bed fusion (LPBF) process of the binary Fe-۱۷wt%Cr model alloy. The mathematical modelis based on a finite volume thermal analysis to accurately predict geometry, temperature distribution and velocity field ofthe resulting molten pool, as well as a phase field microscopic model to simulate rapid solidification microstructures,focusing on segregation of alloying elements, columnar grain structure, and solidification modes. The solidifiedmicrostructure can exhibit different forms of equiaxed, dendritic, cellular, or planar structures as the G/V ratio increases.The study revealed that a high G/V value is often observed in the LPBF, leading to a preference for cellulargrowth overcolumnar dendritic growth. The model is able to predicts Cr concentration profiles, columnar arm spacing and orientation.

کلیدواژه ها:

Laser powder bed fusion ، Solidification microstructure ، Finite volume ، Phase field