Abstract
Simulations of equiaxed solidification using two-phase and three-phase models are performed for the experimental benchmark AFRODITE with electromagnetic stirring. A three-phase model presented by authors elsewhere accounts for solid phase, inter- and extradendritic liquid phases. With respect to that model, the two-phase approach can be considered as reduced or simplified, yet, this implies also less number of assumptions regarding closure relations. In simulations, as expected, final segregation obtained with two–phase model is stronger, yet, it is qualitatively similar to the segregation pattern obtained with three-phase model.
Highlights
In industrial casting production, a large equiaxed grain region is often expected because it is supposed to provide better homogeneity than the structure consisting of columnar grains [1]
To understand results presented below it should be reminded that in the model the density of the solid phase in the buoyancy term is smaller than the density of liquid and that this differences increases with enrichment of the fluid by rejected solute
Summary A two-phase and three-phase equiaxed solidification models are applied to simulations of AFRODITE experiment on solidification of a binary Sn–10 wt.%Pb alloy under the forced convective flow driven by electromagnetic force
Summary
A large equiaxed grain region is often expected because it is supposed to provide better homogeneity than the structure consisting of columnar grains [1]. The interdendritic liquid in the model is united with solid dendrites giving grain phase within an envelope. Similar to Založnik and Combeau [5], to model the sedimentation (here the floating) phenomenon, in the buoyancy term, a constant difference between the solid phase density and a reference density is introduced.
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