3D-FEM Modeling of Macrosegregation in Solidification of Binary Alloys

GOUTTEBROZE, S.; FACHINOTTI, V. D.; BELLET, M.; COMBEAU, H.

Trondheim

Conferencia; 7th International ESAFORM Conference on Material Forming; 2004

European Scientific Association For Material Forming (ESAFORM)

The paper presents a three-dimensional coupled numerical solution of momentum, energy and solute conservation equations, for binary alloys solidification. The mushy zone is modelled by a porous medium, satured in liquid, following Darcy’s law. Microsegregation is governed either by lever rule or Scheil models, assuming local equilibrium at phase interfaces. The resulting solute, momentum and energy transport equations are solved using the Streamline-Upwind Petrov/Galerkin method. All these equations are coupled but solved with a single staggered scheme. The full algorithm was implemented in the 3D code THERCAST. Two applications cases are given: solidification of Sn-Pb and Pb-Sn alloys in a parallelepipedic cavity. Then a comparison with the 2D finite volume code SOLID is made.