Simulation of Electromagnetic Field and Experimental Research on Preparation Process of Semi-Solid A356-0.4%Gd Alloy
The distribution of magnetic induction intensity and electromagnetic force in the semi-solid A356-0.4%Gd alloy melt was studied by numerical simulation,and the influence of the current intensity and current frequency on the magnetic induction intensity and electromagnetic force were analyzed.The simulation results show that the magnetic induction intensity and electromagnetic force increase along the radius from the center of the alloy melt,showing the distribution characteristics of"small core and large edge",and increasing the current intensity and current frequency can significantly increase the magnetic induction intensity and electromagnetic force in the edge area of the alloy melt.The key to full stirring of the alloy melt lies in the electromagnetic force of its edge area.Based on the results of numerical simulations and experiments,the effects of current intensity and current frequency on the primary α-phase in the center and edge regions of the alloy ingot were further studied.The test results show that under the electromagnetic field,the morphology and size of the primary phase at the edge of the ingot are better than those at the core.When melt is poured at 650℃,stirred at current of 5 A,and frenquency of 30 Hz for 15 s and then held at 590℃for 10 min,the morphology of primary phase of alloy is relatively uniform on the whole and has the best morphology.
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