Numerical Simulation of the Solidification Kinetics of Cast Iron

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Abstract
This work proposes a model that is solved numerically to describe the solidification kinetics of castings. In particular, thermal curves and cooling rates are predicted for cast iron of hypoeutectic and eutectic composition. Furthermore, the model is used to establish the influence of the relative locations of the solidifying melt on the cooling curves, the degrees of undercooling, and the heat fluxes. According to the model predictions, the heat generated fluxes become increasingly large as the mould wall is approached. The model is used in predicting the expected eutectic structure, grain size distribution, and interlamellar spacings in a plate-shaped casting of 100 by 100 by 20 mm. In addition, the segregation effects of C, P, and Si are also related to the expected grain structure, and to their effect on the thermal curves. Finally, comparisons between the proposed model and the experimentally determined cooling curves show good agreement.

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