5th International Conference on Advances in Solidification Processes (ICASP-5) 5th International Symposium on Cutting Edge of Computer Simulation of Solidification, Casting and Refining (CSSCR-5)

**Abstract:** A virtual submesh cellular automata method is established to reduce the computational mesh induced artificial anisotropy with high efficiency and the method is applied to simulate the microstructure evolution during laser melting additive manufacturing. The additive manufacturing process is divided into three parts during simulation: random powder deposition, laser melting and rapid solidification. The laser induced temperature field will be calculated by finite difference method and a uniform solute concentration filed will be used for the non-equilibrium solidification. The Lipton-Glicksman-Kurz and Kurz-Giovanola-Trivedi model will be used respectively for the growth of the molten pool boundary and grains nucleated in the bulk. In order to compare with the experiment, the simulation will be implemented with the pulse laser source and the nickel base superalloy. The single crystal substrate was used and the processing parameter to produce single crystal part was predicted by simulation. The final microstructure of parts fabricated by the laser melting additive manufacturing has compared with the simulation result, which shows reasonable agreement. **Keywords:** modified cellular automata simulation, laser additive manufacturing, artificial anisotropy, single crystal prediction