1． Christian-Doppler Laboratory for Advanced Process Simulation of Solidification & Melting, University of Leoben, A-8700 Leoben, Austria 2．Department of Metallurgy, University of Leoben, A-8700 Leoben, Austria
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DOI:
10.7502/j.issn.1674-3962.2015.09.02
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Abstract:
Since 1960s the formation mechanisms of the as-cast structure and macrosegregation during solidification of steel ingots were systematically studied by Flemings and other researchers, and understanding to this issue was significantly achieved, but there is still no mathematical model which can quantitatively predict them. Reason is due to the complexity of the involved multiphase flow phenomena, e.g. interdendritic flow in the mush, sedimentation of free moving (equiaxed) crystals, etc..All these multiphase flow phenomena are coupled with the solidification thermodynamics and diffusion kinetics, affecting the formation of as-cast structure. The development of multiphase computational fluid mechanics (MCFD) and its application in the study of solidification in last two decades provide a new tool for solving the above problem. This report is going to give a brief review of the progress in this area. Some examples are presented to demonstrate the potential and limitations of this tool for the calculation of the as-cast structure and macrosegregation in ingot castings.