Abstract
Modelling and simulation technology is widely used to optimise the casting process and improve the quality of Al alloy castings. A modified cellular automaton model was proposed to simulate the evolution of dendritic microstructure in low pressure die casting of Al–Si Alloy, which accounted for the heterogeneous nucleation, the solute redistribution in both liquid and solid, the interface curvature and the growth anisotropy during solidification. A nucleation model was proposed based upon the experimental data. With the developed models, not only the grain structure but also the dendritic microstructure was simulated during the solidification process. The grain morphology of a step shaped casting and the aircraft turbine wheel casting at different positions were predicted and compared with experimental results.
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