The Study on Simulation Theory of Solidification Microstructure of Alloy Melt Pool in the Laser Additive Manufacturing Process

Abstract

Keywords:Laser additive manufacturing; alloy steel; microstructure of melt pool; phase field method; cellular automaton method. Abstract:With the development of laser additive manufacturing technology (LAM) and computer technology, it has been widely concerned that the simulation method is used to predict the solidification microstructure of alloy melt pool in the LAM process, because simulation method has advantages of short experimental period, low cost and comprehensiveness. This paper respectively introduces the basic principle of phase field (PF) model and cellular automaton (CA) model, and then illustrates the application of simulating the solidification microstructure of alloy melt pool in the process of LAM. In addition, the results of comparative analysis shows that CA method is more suitable for simulating the microstructure of melt pool than PF method in the LAM process. Finally, the existing problems and future development trends of models and algorithms are put forward, which provides a theoretical reference for the laser additive manufacturing of alloy steel.