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
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.
霍玉坤, 赵立华, 包燕平, 王敏, 赵家七, 麻晗. 大方坯皮下负偏析带形成过程的数值模拟[J]. 连铸, 2020, 39(4): 40-44.
HUO Yu-kun, ZHAO Li-hua, BAO Yan-ping, WANG Min, ZHAO Jia-qi, MA Han. Numerical simulation of formation process of subcutaneous negative segregation zone in billet. CONTINUOUS CASTING, 2020, 39(4): 40-44.
SUN H, ZHANG J. Study on the macrosegregation behavior for the bloom continuous casting: Model development and validation[J]. Metallurgical and Materials Transactions:B, 2013, 45(3):1133.
[4]
JIANG D, ZHU M. Solidification structure and macrosegregation of billet continuous casting process with dual electromagnetic stirrings in mold and final stage of solidification: A numerical study[J]. Metallurgical and Materials Transactions:B, 2016, 47(6):3446.
[5]
Sasaki K, Sugitani Y, Kobayashi S, et al. Effect of fluid flow on the formation of the negative segative segregation zone in steel ingots[J]. Tetsu to Hagane, 1979, 65(1):60.
[6]
Asai S, Nishio N, Muchi I. Theoretical analysis and model experiments on electromagnetically driven flow in continuous casting[J]. Transactions of the Iron and Steel Institute of Japan, 1982, 22(2):126.
[7]
Bridge M R, Rogers G D. Structural effects and band segregate formation during the electromagnetic stirring of strand-cast steel[J]. Metallurgical Transactions:B, 1984, 15(3): 581.
[8]
Kor G J W. Influence of circumferential electromagnetic stirring on macrosegregation in steel[J]. Ironmaking and Steelmaking, 1982, 9(6): 244.
DONG Q, ZHANG J, LIANG Q, et al. Numerical modeling of macrosegregation in round billet with different microsegregation models[J]. ISIJ International, 2017, 57(5): 814.
[16]
Qing F, Hongwei N, Bao W, et al. Effects of EMS induced flow on solidification and solute transport in bloom mold[J]. Metals, 2017, 7(3):72.
2020, Vol. 39 
