磁场搅拌方式对Sn-11%Sb合金凝固组织与偏析的影响

Effect of electromagnetic stirring methods on the solidification structure and segregation of Sn-11%Sb binary alloy

中心偏析是钢连铸坯的常见缺陷,严重影响了产品的质量。电磁搅拌是对金属凝固过程进行控制、改善连铸坯质量的有效手段,旋转磁场电磁搅拌在钢的连铸过程中已得到广泛的应用,但螺旋磁场电磁搅拌的研究鲜见报道。以低熔点合金模拟钢的凝固过程,对采用不同电磁搅拌方式改善中心偏析缺陷的效果进行了模拟对比试验。研究了螺旋磁场电磁搅拌和旋转磁场电磁搅拌对Sn-11%Sb二元合金凝固组织的影响,并与常规条件下的凝固组织进行对比。试验结果表明,在相同电磁搅拌参数下,螺旋磁场电磁搅拌比旋转磁场电磁搅拌更能减小铸锭上下部成分之间的差异,细化晶粒,更好地促进铸锭成分均匀化效果。

Center segregation is a kind of common defect in steel billets,which seriously affect the product quality.Electromagnetic stirring,which is one of the effective methods for controlling the metal solidification process,has been widely used in the continuous casting process.However,the research on spiral magnetic stirring was seldom reported.In this paper,effects of electromagnetic stirring methods on overcoming these defects are studied by simulating the solidification process of continuous casting steel with low melting alloys.Effects of different magnetic fields of electromagnetic stirring on solidification of Sn-11%Sb binary alloy have been studied and compared with this alloy in conventional conditions.The results show that,compared with the rotating magnetic field of electromagnetic stirring,the spiral magnetic field of electromagnetic stirring is more effective in decreasing the component difference between the upper and lower parts of the ingot,and it is more effective in refining grains and composition homogenization with the same electromagnetic stirring parameters.