Numerical Modelling of the Concurrent Effect of Solid Deformation and Melt Flow on Heat and Solute Transfer in Binary Alloys, with Application to the Secondary Cooling Stage of Steel Slabs Continuous Casting

FACHINOTTI, V. D.; LE CORRE, S.; BELLET, M.

Ciudad de Buenos Aires

Congreso; VIII Congreso Argentino de Mecánica Computacional (MECOM 2005); 2005

Asociación Argentina de Mecánica Computacional (AMCA)

We introduce a thermo-mechanical and macrosegregation model that considers a solidifying alloy as a binary mixture made of a liquid and a solid phase. Macroscopic conservation laws for mass, momentum and solute are obtained by spatial averaging of the respective microscopic conservation equations. Assuming local thermal equilibrium, a single equation for the conservation of the mixture energy is then written. A single equation can be obtained for the solute as well by invoking a proper microsegregation rule. The numerical implementation in a 2D finite element code is then detailed. In order to validate the two-phase mechanical model, anacademic problem is solved. Lastly, an industrial application for continuous casting of steel slabs is shown, where the ability of the formulation to describe the formation of centralmacrosegregation during the secondary cooling of slab continuous casting processes is enlightened.