Jiwon Park¹, Chang-Seok Oh¹; ¹Korea Institute of Materials Science

When a heat source passes over the build surface during additive manufacturing, the materials undergo rapid solidification that results unique microstructures and properties. Even in a single beam path with straight trajectory, solidification velocity and cooling rate vary with the relative position to the heat source which set different solidification conditions. In this research 3-dimensional microstructure evolution of FCC metal during rapid solidification in additive manufacturing is studied with phase-field modeling. Different solidification conditions extracted from thermal computation were taken to simulate microstructure evolution when the build metal is grown from pre-built layers in [100], [110], and [111] normal directions. The results are also compared with randomly nucleated microstructures.