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| Effects of vertical electromagnetic stirring on grain refinement and macrosegregation control of bearing steel billet in continuous casting |
| Yu Xu1,2,En-gang Wang1,2,*,Zhuang Li1,3,An-yuan Deng1,2 |
1 Key Laboratory of Electromagnetic Processing of Materials Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China
2 School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China
3 School of Materials Science and Engineering, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract The grain refinement and macrosegregation control of GCr15 bearing steel were investigated under a type of rarely-used electromagnetic stirring, vertical electromagnetic stirring (V-EMS), in continuous casting. V-EMS can create an upward electromagnetic force and generate longitudinal loop convection, which enables the better mixing of the upper part with the lower part of the liquid steel. The results showed that applying V-EMS can enlarge the region of the equiaxed grain, decrease the secondary dendrite arm spacing (SDAS) and reduce the segregation of both carbon and sulfur. After applying V-EMS, liquid steel with a high solute concentration is brought to the dendrite tips, making the dendrite arms partially melt. The length of the dendrite fragment is approximately 1��8 mm, 10 to 12 times the SDAS. Upon increasing the amount of cooling water from 2��0 to 3��5 m3/h, the dendrite fragments exhibit an obvious aggregation following V-EMS. Finally, a criterion for dendrite fragmentation under V-EMS was derived based on the dendrite fragmentation theory of Campanella et al.
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Received: 25 July 2016
Published: 12 May 2017
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| Fund:National Nature Science Foundation of China;Key Project of the Ministry of Education of China;111 Project of China |
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Corresponding Authors:
En-Gang Wang
E-mail: egwang@mail.neu.edu.cn
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2017, Vol. 24 
