Effect of axial static magnetic field on cleanliness and microstructure in magnetically controlled electroslag remelted bearing steel  

作　　者：Qiang Li Zhi-bin Xia Yi-feng Guo Zhe Shen Tian-xiang Zheng Biao Ding Yun-bo Zhong 

机构地区：[1]School of Materials Science and Engineering,State Key Laboratory of Advanced Special Steel,Shanghai Key Laboratory of Advanced Ferrometallurgy,Shanghai University,Shanghai,200444,China

出　　处：《Journal of Iron and Steel Research International》2021年第12期1562-1573,共12页

基　　金：This work is supported by the National Key Research and Development Program of China under Grant numbers of 2016YFB0300401,2018YFF0109404,and 2016YFB0301401;the National Natural Science Foundation of China under Grant numbers of U1860202,U1732276,50134010,51704193,51904184,and 52004156;the Users with Excellence Program of Hefei Science Center CAS under Grant number of 2019HSC-UE010,and the Changjiang Scholar Program of Chinese Ministry of Education.

摘　　要：The effect of the axial static magnetic field(ASMF)on cleanliness and microstructure in magnetically controlled electroslag remelted GCr15 bearing steel ingots was investigated experimentally.The results show that a magnetically controlled spin-vibration induced by the interaction of the ASMFs and the remelting current exists at the consumable electrode tip,resulting in thinner liquid melt film and smaller droplets.With the increase in magnetic flux density,the optimization effect of ASMFs on electroslag remelting process increases and reaches the peak with a 40 mT ASMF,then decreases.The cleanliness of the ingots was improved,and the count of inclusions larger than 5μm was reduced.The microstructure of the ingots processed with a 40 mT ASMF was significantly refined.The depth of the metallic molten pool was reduced from 45.2 to 17.5 mm with the application of 40 mT ASMF.The tensile strength,impact toughness,and Rockwell hardness of the ingots obtained under the 40 mT ASMF were significantly improved.The mechanisms of the spin-vibration occurring at the electrode tip end were interpreted in detail to elucidate the effect of ASMFs.

关 键 词：Magnetically controlled electroslag remelting Axial static magnetic field Inclusion removal Molten pool Alternating Lorentz force CLEANLINESS GCr15 bearing steel 

分 类 号：TF769.4[冶金工程—钢铁冶金]