Effects of complex electromagnetic stirring on solidification structure of 60Si2CrVAT spring steel continuous casting billet

摘要

The effect of complex electromagnetic stirring combined M-EMS with alternate changed F-EMS on solidification structure of High Strength Spring (HSS)steel 60Si2CrVAT Continuous Casting Billet has been studied.Analysis of the solidification structure is based on the Primary Dendritic Ann Spacing (PDAS)and the Secondary Dendritic Arm Spacing (SDAS),the carbon segregation,the non-metallic inclusions and the inner porosity of the 60Si2CrVAT billet.It is found that the solidification structure is modified by complex EMS,the extent of the equiaxed structure is considerably increased,the PDAS and the SDAS is reduced obviously with the spindly primary dendrites and narrow PDAS formed,the ratio of carbon segregation is remarkably reduced,the non-metallic inclusions and the inner porosity are also reduced.Therefore,the quality of the 60Si2CrVAT billet is improved by the complex electromagnetic stirring.