A Dual Scale Model for Macrosegregation in Alloy Solidification |
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Authors: | R Pardeshi A K Singh V R Voller |
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Affiliation: | 1. Tata Research Development and Design and Centre , Pune, India;2. Department of Civil Engineering , University of Minnesota , Minneapolis, Minnesota, USA |
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Abstract: | A numerical approach for coupling the temperature and concentration fields using a micro/macro dual scale model for a solidification problem is presented. The dual scale modeling framework is implemented on a hybrid explicit-implicit solidification scheme. The advantage of this model lies in more accurate consideration of microsegregation occurring at micro-scale using a subgrid model. The model is applied to the case of solidification of a Pb–40% Sn alloy in a rectangular cavity. The present simulation results are compared with the corresponding experimental results reported in the literature, showing improvement in macrosegregation predictions. Subsequently, a comparison of macrosegregation prediction between the results of the present method with those of a parameter model is performed, showing similar trends. |
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