Multiscale Modeling of the Vacuum Arc Remelting Process of Titanium Alloy

With the help of the software ANSYS,a finite element model was proposed to simulate the vacuum arc remelting process of a Ø600 mm Ti6Al4V alloy ingot,and the temperature field variation and effect of melting current on the morphology of molten pool in the process was studied.And then the results were coupled to a microstructure simulating model,namely,the CAFD model,to simulate the dendrite growth and segregation behavior of the element V on the solidification front in several characteristic regions.According to the results,the molten pool becomes deeper and mushy zone becomes wider with the increase of the melting current,so that less time is required to achieve steady state of melting;in the steady state of the melting process,relatively short and discrete columnar dendrites grow in the center of the ingot,while continuous columnar dendrites form in the middle-radius and marginal regions.