| The quality demand for the continuous casting billet becomes strict with theincreasing requirements for steel products and development of the casting technique. TheM-EMS can improve the inclusion removal, reduce the surface and interior defects, andoptimize the inter-structure of the billet. Therefore, it is widely investigated and utilized.The distribution of magnetic field and electromagnetic force, as well as the effects ofstirring parameters on magnetic field and electromagnetic force is systemicallyinvestigated (165mm billet). The simulation is conducted with the aid of ANSYS12.0software and the Maxwell’s equations. It is found that the cycle period of rotationmagnetic field is the same with that of stirring current, while the cycle period ofelectromagnetic force is half. The magnetic field and electromagnetic force taper towardthe end and reach the maximum in the center in vertical direction, while they decreasefrom the edge to the center in radial direction. The minimum force is in the centerapproaching zero. Within the range of the investigated factor, the magnetic field andelectromagnetic force increase with the increase of stirring current. The electromagneticforce increased with the increase of cycle period of stirring current. The shield effect onmagnetic field is generated from the copper tube of the mold. This shield effect increasedwith the increase of the thickness of the copper tube. The magnetic field decrease whenthe distance between the stirring loop and the billet increase. Meanwhile, the distributionof electromagnetic force improves, and further investigation is needed.The3D flow and temperature fields are simulated to investigate the effect of the M-EMS. It is found that two pairs of circulation form in vertical section. Thus, the impactdepth is reduced, the fluid flow is separated to the edge, the temperature is reduced invertical direction, and the temperature gradient of solidification front increase.Consequently, the heat transfer is improved, temperature field and the growth of thesolidified shell are more uniform, and inclusion float is also improved. The rotation speedof molten steel increased with the increase of the stirring current and cycle period ofcurrent. |
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