Abstract
Electromagnetic stirring in mold (M-EMS) has been widely used in continuous casting process to improve the solidification quality of the steel strand. In the present study, a 3D multi-physical-field mathematical model was developed to predict the macro transport phenomena in continuous casting mold with M-EMS using ANSYS commercial software, and was adopted to investigate the effect of current intensity (0, 150, 200, and 240 A) on the heat, momentum, and species transports in the billet continuous casting mold with a size of 160 mm × 160 mm. The results show that when the M-EMS is on, the horizontal swirling flow appears and shifts the high-temperature zone upward. With the increase of current intensity, two swirling flows form on the longitudinal section of continuous casting mold and become more intensive, and the flow velocity of the molten steel at the solidification front increases. Thus, the wash effects of the fluid flow on the initial solidified shell become intensive, resulting in a thinner shell thickness at the mold exit and a significant negative segregation of carbon at the billet subsurface.
Highlights
During the continuous casting process, the molten steel enters the mold through the submerged entry nozzle (SEN), and begins to solidify under the intensive primary cooling condition in mold.With the growth of the initial solidified shell, the solutes are rejected into the liquid at the solid/liquid interface due to the lower solubility of the solute in the solid phase, and redistribute through diffusion and mass convection induced by the fluid flow in the mold
Fang et al [25] numerically investigated the fluid flow, solidification and solute transport in the bloom continuous casting with electromagnetic stirring (EMS) and concluded that the initial solidified shell, molten steel temperature, and solute distribution in the EMS effective zone could be effectively homogenized by M-EMS
It can beinseen that,3.asItthe intensity both the measured value the measured value and the calculated measured value have the same trend in that the magnetic and the calculated measured value have the same trend in that the magnetic flux density increasesflux density increases with the intensity, the relative error between themeasured measuredvalue valueisand with the current intensity, andcurrent the relative error and between the measured value and measured value is small, which indicates that the present model is capable of predicting small, which indicates that the present model is capable of predicting the electromagnetic field, and the field, and the can effects be adopted to investigate stirring
Summary
During the continuous casting process, the molten steel enters the mold through the submerged entry nozzle (SEN), and begins to solidify under the intensive primary cooling condition in mold. Sun and Zhang [24] developed a coupling electromagnetic-thermal-solute transportation model and investigated the macrosegregation in continuously cast bloom of high-carbon bearing steel GCr15 with EMS using a 3D and 2D hybrid method. Fang et al [25] numerically investigated the fluid flow, solidification and solute transport in the bloom continuous casting with EMS and concluded that the initial solidified shell, molten steel temperature, and solute distribution in the EMS effective zone could be effectively homogenized by M-EMS. Significant progress has been made in developing multi-physical-field models to reveal the macro-scale transport phenomena in continuous casting mold, our understanding of the interactive effects of fluid flow, heat transfer, initial solidification, and solute distribution with M-EMS is still far from satisfactory.
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