Numerical Simulation And Experiment Study Of The Fluid Flow In Electromagnetic Stirring Casting Of7xxx Aluminium Alloy

Metal solidification process involves complex physical changes, including heat and mass transfer and phase transition. Since electromagnetic stirring development and application it has become an effective means to control solidification process. Electromagnetic stirring can used to improve the equiaxed rate of solidification structure, refinement grain size, reducing inclusions and to promote uniform composition. In this paper, a numerical simulation model has been made, the flow pattern of the7050aluminum alloy melt in the crucible under electromagnetic stirring has been obtained. Studied the influence of electromagnetic stirring process parameters, such as the current intensity and frequency,on the flow pattern of the melt, provided an effective basis for the adjustment of electromagnetic stirring process parameters.This paper based on the large commercial finite element analysis software ANSYS to simulated the electromagnetic field, fluid flow of7050melt in the crucible under the effect of electromagnetic stirring. The3-D finite element model of electromagnetic stirrer was built. Investigated the magnetic and force field distribution in the mold under different current intensity and frequency conditions. And through the ANSYS multi-physical coupling function, the electromagnetic force as a body load to join the flow field to calculate the flow field of melt.The simulation results show that the distribution of magnetic field and force field. Under the same condition of current frequency, with the increase of the current intensity, the magnetic induction intensity and the electromagnetic force are increased. This is conductive to stir melt. Under the same condition of current intensity, with the increase of the current frequency, the magnetic induction intensity is decreased, but the magnetic force is increased. The result of fluid field shows that the speed of melt increased with the increase in current intensity and frequency.The scheme of experiment has been drawn up. Obtain four ingots in different conditions:no electromagnetic field; fixed current intensity in10A, change current frequency as10Hz、13Hz、16Hz. Observing and comparing the microstructure of the test samples. The experiment result shows that electromagnetic stirring can promotes the coarse and oriented columnar grains and the dendrites transforming into the equiaxed grains. The electromagnetic stirring device in the working parameters for10A,16Hz can get better stirrig effect.