Simulation of microstructures in solidification of
aluminum twin-roll casting based on CA
(1. School of Aeronautics and Mechanical Engineering, Nanchang Hangkong University,
Nanchang 330063, China;
2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Nanchang 330063, China;
2. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China)
Abstract: The microstructures in the solidification process of aluminum twin-roll casting was simulated based on CA (Cellular Automation Method), and the nucleation model based on the normal distribution and KUZR-GIOVANOLS-TRIVEDI(KGT) growth model were used in the calculation. FDM (Finite Difference Method) combined with relative motion was used, and dynamic evolution of microstructures in the process of aluminum twin-roll casting was achieved. Visual Fortran programming language was adopted to calculate and realize the image post-processing. Moreover, the effect of different casting process parameters on the formation of the microstructures was simulated. The results are helpful to explaining the dendritic segregation and size segregation as well as shrinkage-porosity defects. Columnar grains mainly distribute near the casting roller while equiaxed grains distributed far away from the casting roller.
Key words: Cellular Automation; microstructure; numerical simulation; twin-roll casting