The Effects of Micro Scale Solute Redistribution on the Macro Scale Heat and Mass Transfer During Casting Processes

One-dimensional plate-like dendritic model is built to describe the microsegregation during binary alloy solidification with solid back-diffusion and complete diffusion in the liquid. The specialties of microsegregation for Al-Cu and Fe-C alloys are analyzed and compared by simulation. Moreover, the microsegregation model is developed to couple with the macro solidification model which simulates the heat and mass transfer with phase change for the new Inverse Casting Technology. The numerical results are proven to be in good agreement with experimental data. It shows that the microsegregation numerical model can reflect the micro mass transfer accurately and can be coupled reliably with macro heat and mass transfer model for solidification. In addition, both the micro and macro investigation shows that the solidification of Fe-C alloy progresses almost in equilibrium.