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Numerical simulation of macrosegregation: a comparison between finite volume method and finite element method predictions and a confrontation with experiments

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Abstract

Micro-macrosegregation calculations have been performed for a rectangular cavity containing either a Pb-48 wt pct Sn alloy or a Sn-5 wt pct Pb alloy. The numerical results calculated with a finite volume method (FVM) and a finite element method (FEM) are compared with experimental results previously obtained by Hebditch and Hunt. The two methods are based on the same average conservation equations governing heat and mass transfer and the same assumptions: lever rule, equal and constant density of the solid and liquid phases (except in the buoyancy term), permeability of the mushy zone given by the Carman-Kozeny relation, and no transport of the solid phase. Although the same parameters are used in both calculations, small differences are observed as a result of the different formulations. In particular, the instabilities appearing in the mushy zone (channels) of the Sn-5 wt pct Pb alloy are more pronounced with the FVM formulation as compared with FEM, whereas the opposite trend is observed for the Pb-48 wt pct Sn alloy. Nevertheless, the final segregation maps at the end of solidification compare fairly well with the experimental findings.

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Authors and Affiliations

  1. Chaire d’analyse et simulations numériques, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    N. Ahmad (Postdoctoral Fellow) & J. Rappaz (Professor)

  2. Laboratoire de Métallurgie Physique, Ecole Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland

    J. -L. Desbiolles (Staff Member), T. Jalanti Ph.D. Student & M. Rappaz (Professor)

  3. Laboratoire de Science et de Génie des Matériaux Métalliques, INPL, Ecole des Mines de Nancy, F-54042, Nancy, Cedex, France

    H. Combeau (Assistant Professor), G. Lesoult (Professor) & C. Stomp (Postdoctoral Fellow)

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  1. N. Ahmad
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  2. J. Rappaz
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  3. J. -L. Desbiolles
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  4. T. Jalanti Ph.D. Student
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  5. M. Rappaz
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  6. H. Combeau
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  7. G. Lesoult
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  8. C. Stomp
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Ahmad, N., Rappaz, J., Desbiolles, J.L. et al. Numerical simulation of macrosegregation: a comparison between finite volume method and finite element method predictions and a confrontation with experiments. Metall Mater Trans A 29, 617–630 (1998). https://doi.org/10.1007/s11661-998-0143-9

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  • DOI: https://doi.org/10.1007/s11661-998-0143-9

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