First analysis of a numerical benchmark for 2D columnar solidification of binary alloysReport as inadecuate

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1 TREFLE - Transferts, écoulements, fluides, énergétique 2 CEMEF - Centre de Mise en Forme des Matériaux 3 LSG2M - Laboratoire de Science et Génie des Matériaux et de Métallurgie 4 SIMaP - Science et Ingénierie des Matériaux et Procédés 5 FAST - Fluides, automatique, systèmes thermiques 6 BENHA Institut 7 EM2C - Laboratoire d-Énergétique Moléculaire et Macroscopique, Combustion

Abstract : During the solidification of metal alloys, chemical heterogeneities at the product scale macrosegregation develop. Numerical simulation tools are beginning to appear in the industry, however their predictive capabilities are still limited. We present a numerical benchmark exercise treating the performance of models in the prediction of macrosegregation. In a first stage we defined a -minimal- i.e. maximally simplified solidification model, describing the coupling of the solidification of a binary alloy and of the transport phenomena heat, solute transport and fluid flow that lead to macrosegregation in a fully columnar ingot with a fixed solid phase. This model is solved by four different numerical codes, employing different numerical methods FVM and FEM and various solution schemes. We compare the predictions of the evolution of macrosegregation in a small 10×6 cm ingot of Sn-10wt%Pb alloys. Further, we present the sensitivities concerning the prediction of instabilities leading to banded channel mesosegregations.

Keywords : Solidification Binary Alloys Mushy region Numerical Simulation Macrosegregation

Author: Eric Arquis - Michel Bellet - Hervé Combeau - Yves Fautrelle - Dominique Gobin - Olga Budenkova - Bernard Dussoubs - Yves Duterr



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