Modified Cellular Automaton Simulation of Metal Additive Manufacturing

Metal additive manufacturing (AM) technologies are attracting attentions not only as a fabrication process of complicated three-dimensional parts but also microstructure controlling processes. In powder bed fusion (PBF)-type AM, crystallographic texture can be controlled by scanning strategies energy beam. To optimize microstructures, computer simulations for predicting microstructures play very important roles. this work, we have developed simulation programs to explain the mechanism crystal orientation control. First, simulated shape melt pool analyzing heat transfer using apparent conductivity when penetration laser beam through keyholes was taken into consideration because evaporation and accompanying convections. It assumed that primary growth direction determined temperature gradient, crystals grow keeping generally recognized. The shapes pools agree well with experimental observations. modified cellular automaton successfully reproduced two typical textures different preferential orientations along building directions 〈100〉 〈110〉 bidirectional without rotation 90°, respectively, accomplished between layers.