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The effects of the final electromagnetic stirring(EMS)on the solidification structure of 60Si2CrVAT high strength spring(HSS)steel of continuous casting(CC)billets has been studied.The analysis of the solidification structure is based on the comparison between the macrostructure,microstructure,carbon segregation and defects of the 60Si2CrVAT billet with mold-electromagnetic stirring(M-EMS)and those with the M+ final solidification zone electromagnetic stirring(F-EMS).It is found that the solidification structure of the billet with the F-EMS is improved with the tightness of the billet and the increase in the ratio of the equiaxed structure,the inner porosity and the shrinkage are remarkably reduced,and that the ratio of central carbon segregation sharply decreases.Meanwhile,the secondary dendrite arm spacing(SDAS)is improved,and the ratio of central equiaxed grain considerably increases,which results in finer grains.Therefore,the quality of the billet is enhanced with the F-EMS.
The effects of the final electromagnetic stirring (EMS) on the solidification structure of 60Si2CrVAT high strength spring (HSS) steel of continuous casting (CC) billets has been studied. The analysis of the solidification structure based on the comparison between the macrostructure, microstructure , carbon segregation and defects of the 60Si2CrVAT billet with mold-electromagnetic stirring (M-EMS) and those with the M + final solidification zone electromagnetic stirring (F-EMS) .It is found that the solidification structure of the billet with the F-EMS is improved with the tightness of the billet and the increase in the ratio of the equiaxed structure, the inner porosity and the shrinkage are remarkably reduced, and that the ratio of central carbon segregation sharply decreases.Meanwhile, the secondary dendrite arm spacing (SDAS) is improved, and the ratio of central equiaxed grain substantial increases, which results in finer grains. Before, the quality of the billet is enhanced with the F-EMS.