Abstract
A 3D numerical model was built to investigate the transport phenomena in slab continuous casting process with secondary electromagnetic stirring (S-EMS). In the model, the columnar grain grew from strand surface and it should be treated as a porous media. While for the equiaxed zone, the nucleated grain moves with fluid flow in the earlier stage and it was regarded as a slurry. The model was validated by measured strand surface temperature and magnetic induction intensity. The results show that the solidification end near the 1/4 width of slab was postponed, due to the liquid flow from a submerged entry nozzle injected to the strand’s narrow face. As the linear stirring in the same direction is applied, liquid moves from side B to side A and then penetrates deep downward with higher temperature. In the later stage, the solidification end near the side A is postponed and the solute element is concentrated. When linear stirring in the opposite direction is used, the solidification end near the side A moves backward, while that near the side B moves forward. Moreover, it is found that the solute segregation in the side B is deteriorated, but that in the side A is reduced. As rotational stirring mode is applied, the evenness of solidification end profile is improved and the centerline segregation is reduced, especially with higher current intensity. Therefore, it is concluded that the linear stirring mode is not appropriated for slab casting, while the rotational stirring mode is more suitable.
Highlights
In molten steel solidification process, the solute element is rejected from solid dendrite and enriches in the liquid phase
Coupled electromagnetic field and fluid flow, Liu et al [4] simulated the transport behavior in the round-bloom casting with M-electromagnetic stirring (EMS) and found the slag distribution was clearly affected by stirring flow, while the solidification behavior was not considered in the model
It is obtained that both data show a good agreement, the predicted temperature is a little higher than the measured
Summary
In molten steel solidification process, the solute element is rejected from solid dendrite and enriches in the liquid phase. Sun and Zhang [9] observed that the solute segregation changes from positive to negative near strand surface, attributed to stirring flow in the mold zone. Jiang and Zhu [10] applied a multiphase solidification model to simulate transport phenomena in the billet casting They found that liquid steel reached undercooling state near the mold exit with M-EMS applied and strand center segregation can be reduced with appropriated current intensity, installed position, and stirring mode of F-EMS. Model coupling the electromagnetic field, fluid flow, heat transfer, and solidification phenomena was developed to investigate the stirring mode and stirring intensity on the transport behavior in the continuous casting slab. The model is validated by the measured magnetic induction intensity of stirrer and strand surface temperature
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