Simulation study on the effect of VAR magnetic stirring process on the melt flow
The flow behavior of melt in vacuum consumable arc melting affects the solidification char-acteristics of ingots.Direct observation of the melt motion is difficult,so revealing the flow behavior of the melt by simulation is crucial.In this paper,a self-developed three-dimensional simulation model was used to study the melt flow behavior and pool morphology during the melting process under differ-ent stirring process parameters.The research shows that with an increase in the stirring current from 0.01 A to 25 A(under a stirring period of 8 s),the rotational speed of the melt increases near-linearly from 0.000 1 m/s to 0.212 m/s,and the molten pool gradually widens(from V-shaped to U-shaped).In the meanwhile,there is an obvious process of first decreasing and then increasing in the maximum depth and volume of the molten pool.As the stirring period increases from 1 s to 24 s(under a stirring current of 5 A),the rotational speed of the melt gradually increases from 0.012 5 m/s to a high value(0.081 8 m/s at 16 s)and then tends to stabilize.The molten pool gradually widens,and the maximum depth of the molten pool gradually decreases to a minimum value and then tends to stabilize.The stir-ring current and stirring period can affect the rotation and planar motion of the melt,but their affecting mechanisms are different.
titanium alloyvacuum arc remeltingstirring magnetic fieldmolten flow
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