Out-of-phase pulsed electromagnetic semi-continuous casting of large size magnesium alloy slab based on multi-field coupling solution
This paper studied the semi-continuous casting of large-scale magnesium alloy slab.The macro physical field in the semi-continuous casting process of magnesium alloy slab was simulated by numerical simulation technology based on multi-field coupling.The effects of the phase difference of out-of-phase pulsed magnetic field on the electromagnetic force,temperature field,solidification process,solute element distribution and macrosegregation were studied.The results show that the phase difference has more obvious effect on the middle and late solidification stages.When the phase difference increases from 0° to 72°,the heat transfer is weakened in the early solidification stage,while it is promoted in the middle and late solidification stages.Meanwhile,the shallower depth of liquid hole and the accelerated solidification rate in the central part are achieved,and the temperature field in the cross section becomes uniform.In addition,increasing the phase difference to 72° is beneficial to alleviate the problem of solute poverty in the two-phase region and reduce the maximum negative segregation rate and the overall segregation rate in the cross-section after solidification.However,when the phase difference continues to increase to 108°,the heat transfer intensity decreases not only in the early solidification stage significantly,but also in the middle and late solidification stages,leading to the deeper liquid hole,lower solidification rate and higher segregation rate.
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