Numerical Simulation of In-mold Electromagnetic Stirring on Slide Gate Caused Bias Flow and Solidification in Slab Continuous Casting

Lu, Haibiao; Li, Bin; Li, Jiaxun; Zhong, Yi; Ren, Zhongming; Lei, Zuosheng

doi:10.2355/isijinternational.isijint-2020-745

Cited by 11 publications

(7 citation statements)

References 27 publications

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“…The MFD distribution is radially symmetrical, with MFD at the edges of a wider wall greater than that at the center of the cross-section. Similar results are also observed by Lu et al (2021). Figure 4 illustrates MFD distribution along the radial distance of the mold at the stirrer center plane (Z = 0.3 m) and the central vertical axis along the length of the computational domain.…”

Section: Resultssupporting

confidence: 81%

Effect of electromagnetic stirring on the transient flow, solidification and inclusion movements in the continuous casting slab mold

Kumar

Jha

2023

HFF

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Purpose The purpose of this study is to explore how a time-varying electromagnetic stirring (EMS) affects the fluid flow and solidification behavior in a slab caster continuous casting mold. Further, the study of inclusion movements in the mold is carried out under the effect of a time-varying electromagnetic field. Design/methodology/approach A three-dimensional coupled numerical model of solidification and magnetohydrodynamics has been developed for slab caster mold to investigate the inclusions transport by discrete phase model with the use of user-defined functions. Enthalpy porosity and the Lagrangian approach are applied to analyze the behavior of solidification and inclusion. Findings The study shows that the magnetic field density distribution has a radial symmetry in relation to the stirrer’s center. As the EMS current intensity increases, the strength of the lower recirculation zone gradually decreases and nearly disappears at higher intensities. Additionally, the area of localized remelting zone expands in the solidification front with rising current intensity. The morphology of inclusions and EMS current intensity have a significant impact on the behavior and movement of inclusions within the molten steel. Practical implications By using the model, one can optimize the EMS parameter to enhance the quality of steel casting through the elimination of impurities and by improving the microstructure of cast that mainly depend on solidification and flow patterns of molten steel. Originality/value Until now, the use of time-varying EMS in the slab caster mold to study solidification and inclusion behavior has not been explored.

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Section: Resultssupporting

confidence: 81%

Effect of electromagnetic stirring on the transient flow, solidification and inclusion movements in the continuous casting slab mold

Kumar

Jha

2023

HFF

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“…Symmetry index, S , is defined as follows. [ 15 ]

S = \frac{1}{n} \sum_{1}^{n} \frac{\min false(u_{M_{i}}, u_{N_{i}} false)}{\max false(u_{M_{i}}, u_{N_{i}} false)}

u = \sqrt{u_{x}^{2} + u_{y}^{2}}

where u is the 2D velocity of the characteristic point (m s −1 ), M i and N i denote the symmetry points, n = 500, u x is the x ‐component velocity (m s −1 ), and u y is the y ‐component velocity (m s −1 ). Equation (17) was used to calculate values at 15, 20, and 25 mm from the inner and outer curved walls of the mould.…”

Section: Resultsmentioning

confidence: 99%

“…Lu et al [ 14 ] developed a 3D numerical model to investigate the phenomenon of bias flow caused by slide gates and found that increasing the electromagnetic stirring current and reducing the pulling speed could improve the bias flow of steel; however, it cannot be eliminated completely. Zhang et al [ 15 ] investigated the effect of electromagnetic process parameters on the flow and temperature fields in a mould and showed that defects such as central segregation, central cracks, and central porosity can be improved by optimizing the electromagnetic parameters.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Nozzle Position on Fluid Flow and Solidification in a Billet Curved Mould using Mould Electromagnetic Stirring

Wang

Qiu

Zhu

et al. 2023

steel research int.

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Owing to the smaller cross-sectional size of the billet, the effect of the position of the submerged entry nozzle (SEN) on the fluid flow in a curved mold is more prominent. The transient fluid flow, heat transfer, and solidification behavior at different nozzle positions and mold electromagnetic stirring (M-EMS) are investigated using a 3D transient mathematical model. The symmetry index, S, is introduced to quantitatively evaluate the symmetry of the flow field. When the SEN is offset to the outer curve, S is the highest, the flow field mixing is the best, and the liquid level fluctuation is minimal. When the SEN is offset to the inner curve, S is the lowest, and the washing of the solidified shell on the inner curve side is more significant, causing the solidified shell thickness on the inner curve to be thinner, which can easily cause steel breakout accidents. The M-EMS can improve the uneven flow field caused by the nozzle position. In actual production, the SEN can be appropriately offset to the outer curve, and the application of M-EMS can improve the flow field distribution of molten steel.

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“…At the inlet, the velocity at the nozzle port can be obtained according to the mass balance law, other variables are set on the base of the inlet velocity. [20][21][22] At the outlet of continuous caster, the normal gradients of all variables are equal to zero. The normal velocity is zero and the normal gradients of other variables are equal to zero near the free surface, and the solidified shell moves down at the casting speed.…”

Section: Flow Fieldmentioning

confidence: 99%

Numerical Simulation for Magnetohydrodynamic Flow and Solidification in an Ultra-wide Slab Continuous Caster with Electromagnetic Stirring Roller

Fang¹,

Huang³

et al. 2022

ISIJ Int.

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Electromagnetic stirring with segment roller in the secondary cooling zone is a very important metallurgical technology for the continuous casting of the ultra-wide slab. Thus, numerical simulation is applied to investigate magnetohydrodynamic flow and solidification in the continuous caster with strand electromagnetic stirring. Numerical results showed that, the predicted values agree well with the experimental data. If the electromagnetic stirring roller with the symmetric split structure forms the symmetric magnetic field, there are the symmetric electromagnetic force, the symmetric flow field and the symmetric solidified shell. If the single electromagnetic stirring roller with the symmetric split structure forms the symmetric electromagnetic force, the flow field is like a butterfly. If the two electromagnetic stirring rollers forms the symmetric electromagnetic force, the flow field is like two butterflies. The effect of strand electromagnetic stirring on the fluid flow in the mold can not be ignored in the case of SSR (Same direction for upper rollers, Same direction for lower roller, Reverse direction for relation between upper/lower rollers), and it can be ignored in the case of NAS (No upper rollers, Away direction for lower roller, Single roller for relation between upper/lower rollers) and CAR (Close direction for upper rollers, Away direction for lower roller, Reverse direction for relation between upper/lower rollers).

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Numerical Simulation of In-mold Electromagnetic Stirring on Slide Gate Caused Bias Flow and Solidification in Slab Continuous Casting

Cited by 11 publications

References 27 publications

Effect of electromagnetic stirring on the transient flow, solidification and inclusion movements in the continuous casting slab mold

Effect of electromagnetic stirring on the transient flow, solidification and inclusion movements in the continuous casting slab mold

Effect of Nozzle Position on Fluid Flow and Solidification in a Billet Curved Mould using Mould Electromagnetic Stirring

Numerical Simulation for Magnetohydrodynamic Flow and Solidification in an Ultra-wide Slab Continuous Caster with Electromagnetic Stirring Roller

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