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Phase-field model for the description of primary phase formation during solidification

A numerical model based on a phase-field method has been developed in order to describe the formation of the primary solid phase in multicomponent systems. This two-dimensional model can simulate the growth of individual dendritic grains in a selected zone of a casting. The model provides a direct simulation of the grain morphology evolution and microsegregation patterns.

The method is based on the resolution of the solute diffusion equations including the effects of interface curvature and attachment kinetics at the interface. The calculations are performed from the knowledge of the average local concentration at the end of solidification and of the local thermal history.

These quantities are obtained from a macroscopic calculation on the scale of the casting. At present, the model is limited to binary systems but extension to multi-component systems might be considered in the future.

This model is an alternative approach to the pseudo-front tracking method for the prediction of as-cast microstructures. It is intended to be used as a comparison tool. It may also offer shorter computation times than the pseudo-front tracking methods for purely dendritic microstructures.

Reported by

Ecole Polytechnique Fédérale de Lausanne
Laboratoire de métallurgie physique
1015 Lausanne
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