Abstract
A weakly integrated micro–macroscopic model is developed to describe the macrosegregation formation by multicomponent thermosolutal convection during solidification of a four-element steel ingot (100 t). It weakly couples the modified cellular automata (MCA) model with the solution of the macroscopic transport equations. The MCA simulation is firstly carried out at the microscale to depict the dendritic morphology. Relationships between mean secondary dendrite arm spacing and solid fraction for different cooling rates and maximum nucleation densities are built up. Then, conservation equations of momentum, energy and solute are solved at the macroscale to predict the macrosegregation distribution in a 100 t ingot. The SDASmean−fs relation obtained by the MCA model enters the permeability model of the mushy zone. Numerical prediction from the present model shows better agreement with the experimental measurement of carbon segregation. The influences of grain morphology upon macrosegregation are investigated. Results show that macrosegregation becomes serious for a coarser dendritic structure.
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