NUMERICAL SIMULATION OF SOLIDIFICATION STRUCTURE FORMATION OF CASTING IN MULTI-COMPONENT ALLOY USING PF-CA METHOD

摘要

Numerical simulation of the solidification structure formation process of aluminum-base multi-component alloys (AC2A, AC2B and AC8C commercial alloys) were carried out using a PF-CA model, which is a model developed by coupling a cellular automaton (CA) method with a phase-field (PF) method. In the model, growth kinetics of a dendrite tip was evaluated from a phase-field simulation of dendrite growth in the multi-component alloys. Macro grain structure formation of castings of the multi-component alloys were simulated by using a cellular automaton method. In the simulation, the evaluated kinetics of a dendrite tip was used instead of the KGT model, which is commonly used as growth kinetics of a dendrite tip for cellular automaton simulation of solidification structure formation. A casting experiment for the multi-component alloys was carried out, and the observed solidification structures were compared with simulated macrostructures of the castings. In the case of the AC2A commercial alloy, the simulated macrostructure was in good agreement with the experimentally observed one. In the case of the AC2B commercial alloy, although the simulated macrostructure near the mold wall was different from the experimentally observed one, the size of inner equiaxed crystals was similar to that observed in the experiment. In the case of the AC8C commercial alloy, the simulated macrostructure was not similar to the experimentally observed one.