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| Numerical simulation of formation process of subcutaneous negative segregation zone in billet |
| HUO Yu-kun1,2, ZHAO Li-hua1,3, BAO Yan-ping3, WANG Min3, ZHAO Jia-qi4, MA Han4 |
1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. MCC Capital Engineering and Research Incorporation Co., Ltd., Beijing 100176, China;
3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China;
4. Institute of Research of Iron and Steel(IRIS)of Shasteel, Zhangjiagang 215625, Jiangsu, China |
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Abstract In response to the internal quality problems of the bloom in a steel plant, coupled with electromagnetic-flow-heat-solute transport, three-dimensional mathematical model was established to study the formation process of negative segregation band under the surface of bloom. The results show that formation of negative segregation band is the result of combined action of the solidification front flow rate and solidification rate. For the four-hole nozzle, there will be undergo twice negative segregation under bloom surface, and the first negative segregation was caused by nozzle jet, the second is caused by the M-EMS. The change of magnetic stirring parameters will just affect the degree of negative segregation but neither can affect the position and width of the negative segregation band, nor can it improve the positive segregation degree of the bloom center.
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Received: 09 April 2020
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2020, Vol. 39 
