Effects of F-EMS on the solidification structure of 60Si_2CrVAT spring steel billets  

作　　者：HU Junhui WANG Kai GU Wenjun 

机构地区：[1]Special Steel Business Unit, Baoshan Iron ＆ Steel Co., Ltd., Shanghai 200940,China

出　　处：《Baosteel Technical Research》2009年第4期41-46,共6页宝钢技术研究（英文版）

基　　金：supported by the School of Material Science and Engineering,Shanghai University for its experimental test

摘　　要：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 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.

关 键 词：electromagnetic stirring spring steel solidification structure 

分 类 号：TG146.21[一般工业技术—材料科学与工程] X322[金属学及工艺—金属材料]