First analysis of a numerical benchmark for 2D columnar solidification of binary alloys

Eric Arquis (1) , Michel Bellet (2) , Hervé Combeau (3) , Yves Fautrelle (4) , Dominique Gobin (5) , Olga Budenkova (4) , Bernard Dussoubs (3) , Yves Duterrail (4) , Arvind Kumar (3) , Salem Mosbah (3) , Mohamed Rady (6) , Charles-André Gandin (2) , Benoit Goyeau (7) , Miha Zaloznik (3)

1 TREFLE - Transferts, écoulements, fluides, énergétique
2 CEMEF - Centre de Mise en Forme des Matériaux
3 IJL - Institut Jean Lamour
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

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.

Mots clés: Solidification; Binary Alloys; Mushy region; Numerical Simulation; Macrosegregation

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Eric Arquis, Michel Bellet, Hervé Combeau, Yves Fautrelle, Dominique Gobin, et al.. First analysis of a numerical benchmark for 2D columnar solidification of binary alloys. 4th International Conference on Modelling and Simulation of Metallurgical Processes in Steelmaking, Jun 2011, Düsseldorf, Germany. 7 p. ⟨hal-00675486⟩