Abstract
The magnetic, heat transfer and flow phenomenon occurring in the continuous casting process under the mold electromagnetic stirring was further analyzed by solving the 3-D electromagnetic field mathematical model and flow solidification model with finite element method and finite volume method, respectively. The results indicate that the solidified shell thickness located in the effective stirring region fluctuates because of the unsteady scouring under the mold electromagnetic stirring. The maximum rotational velocity is a key parameter to the solidification of the billet when controlling the stirring intensity. When the rotational velocity reaches 0.32 m/s, the mush zone enlarges significantly and the solidification rate is further accelerated. The number of vortexes in the lower recirculation zone is not only two and depends on the stirring parameters. Besides, the secondary flow is closely associated with the solidification. Compared with the results of the model ignoring the influence of solidification on the flow of molten steel, the flow pattern within the lower recirculation region changes dramatically, and thus a coupling analysis of the flow, heat transfer, and solidification is essential when simulating the electromagnetic continuous casting process.
Highlights
The mold electromagnetic stirring (M-EMS) has been widely used in the continuous casting process to improve the surface quality, refine grain size, and reduce segregation [1]
The magnetic, heat transfer and flow phenomenon occurring in the continuous casting process under the mold electromagnetic stirring was further analyzed by solving the 3-D electromagnetic field mathematical model and flow solidification model with finite element method and finite volume method, respectively
In this paper, based on the commercial software of ANSYS APDL and CFX, the user-defined procedures were developed for the solidification process so that a mathematical model containing magnetic field, heat transfer, flow, and solidification simultaneously was established to gain a deep insight into the flow and solidification of the billet with the M-EMS
Summary
The mold electromagnetic stirring (M-EMS) has been widely used in the continuous casting process to improve the surface quality, refine grain size, and reduce segregation [1]. In order to save the simulation time, the computational domain was usually restricted in the mold, whereas the fact that M-EMS has a strong effect on the whole billet was proved [20]. In this paper, based on the commercial software of ANSYS APDL and CFX, the user-defined procedures were developed for the solidification process so that a mathematical model containing magnetic field, heat transfer, flow, and solidification simultaneously was established to gain a deep insight into the flow and solidification of the billet with the M-EMS. A comparison of the flow pattern with M-EMS between the models considering solidification and without considering solidification was conducted to show how solidification deeply influences the flow of molten steel. The modeling domain consisted of a billet up to 9.3 m from the meniscus, which exposed the effect of stirring current on the surface temperature of billet, the length of liquid core, and the thickness of solidified shell
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