基于元胞自动机的激光熔覆涂层凝固组织模拟OA

Based on a cellular automaton model and Matlab platform,this study conducted numerical simulations on the microstructural evolution of solidification and crystallization processes of laser-cladded single-channel,single-layer,and multi-layer coatings.By constructing the dynamic evolution rules of cellular states,the regulation mechanism of laser energy input on melt pool temperature and cooling rate,as well as its influence on grain nucleation growth behavior,were analyzed.The results indicate that the temperature distribution of the melt pool and the cooling rate significantly affect the grain morphology,size,and formation timing;high energy input suppresses nucleation density and promotes the transformation from columnar to equiaxed crystals by reducing the cooling rate of the melt pool;during the process of overlapping and stacking the melt,the heat input from the back layer melting will cause partial remelting of the front layer,and the interaction between the new melt pool and the unmelted grains will lead to dynamic changes in the number of grains.The simulation results are highly consistent with the observed grain distribution in the cross-section of the molten pool,verifying the mechanism by which laser energy input affects surface mechanical properties by regulating solidification interface characteristics.This study provides theoretical support for optimizing laser cladding process parameters and predicting microstructure properties,while also confirming the effectiveness and innovation of cellular automata methods in simulating complex solidification processes.