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Multi-physical transport in billet mold of cord steel 82B with electromagnetic stirring |
WANG Zhao-hui, LUO Sen, WANG Wei-ling, ZHU Miao-yong |
School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China |
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Abstract Transport phenomenon of momentum, heat, and solute are very complicated during solidification process of continuously casting billet with mold electromagnetic stirring (MEMS). So, mold electromagnetic stirring has great influence on the billet quality. In order to study the effect of MEMS on complicated transfer phenomenon and understand interactions between them during billet solidification process, a 3D multi-physical fields coupling model for continuous casting process with MEMS was established. Solidification process of cord steel 82B billet in mold with MEMS was simulated with this model. The model was validated by comparison between simulated and measured results. Numerical results show that, as MEMS current increase, flow intensity in mold become stronger, vertical flow velocity at billet center near the exit of mold first decrease, then turn round, and increase continuously. Heat transfer of billet, subcutaneous negative segregation of 82B billet, and solute enrichment in melt pool of 82B billet during continuous casting process are all promoted with increasing mold electromagnetic stirring current. As electromagnetic stirring current is 280 A, maximum tangential velocity of liquid steel along X-axis in cross sections at MEMS center is 0.23 m/s, and minimum mass fraction of carbon at negative zone and mass fraction of carbon in liquid pool at billet center are 0.706% and 0.872% respectively in the cross section 1.5 m away from meniscus
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Received: 27 May 2022
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