Numerical Simulation of Macrosegregation in 570-Ton Low-Alloyed Steel Ingot

We developed a numerical analysis code for macrosegregation in large ingots of Fe-C based multi-component alloys. A numerical simulation of macrosegregation in a 570-ton low-alloyed steel ingot was performed using the developed code in 2-dimensional axisymmetric coordinates. The calculated segregation pattern was compared to the macrostructure of the actual ingot to verify the practical effectiveness of the developed code. A solidification-microsegregation model that takes into account both the equilibrium redistribution of carbon and the non-equilibrium redistribution of other elements was formulated and used in this simulation. In the simulation, numerous inverted V segregations formed as was observed in the longitudinal macrostructure of the actual ingot. The computed carbon profile along the centerline of the ingot presents a similar tendency to that of the actual measurement value. The developed code can be applied to the prediction of macrosegregation in large steel ingots.