Modeling of Inclusion Capture in a Steel Slab Caster with Vertical Section and Bending

Cho, Seong‐Mook; Thomas, Brian G.; Hwang, Jong‐Yeon; Bang, Jong-Geun; Bae, Il-Sin

doi:10.3390/met11040654

Cited by 12 publications

(11 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this region, the downward liquid velocity roughly balances the particle terminal rising velocity, which increases the chance of suspending large particles at the solidification front long enough to be captured by the engulfment mechanism. Similar capture bands have been observed in other recent measurements conducted on commercial continuous-cast slabs [10,11].…”

Section: Model Validationsupporting

confidence: 89%

Model of multiphase flow, superheat transport, and particle capture in a steel continuous caster

Liang

Cho

Ruan

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

A model of turbulent multiphase flow, heat transfer, and particle entrapment during continuous casting of steel is presented. The model includes the top 7m of the vertical and curved strand, and considers the effects of argon gas injection and thermal buoyancy. RANS model flow results are compared with LES. Lagrangian particle transport through the Eulerian-Eulerian multiphase flow field from the k-ɛ RANS model is based on random walk and features advanced particle capture criteria, improved from previous work by including anisotropic turbulent velocity fluctuations near the walls. Particle capture via 3 mechanisms is included: capture by solidified hooks at the meniscus, entrapment between dendrites, and engulfment by surrounding large particles. The fluid flow and bubble/inclusion capture results are validated with plant measurements, including nail board dipping tests and ultrasonic tests of particle locations, and good agreement is seen. The superheat has negligible effect on flow in the mold region but causes complex flow in the lower strand by creating multiple recirculation zones due to the thermal buoyancy. With high (30 K) superheat, this leads to less penetration, and slightly fewer and shallower capture of particles. Lower (10 K) superheat may enable significant top surface freezing, leading to very large internal defect clusters. Lower superheat also leads to deeper meniscus hooks, and more surface capture. Capture bands occur near the transition from vertical to curved, where downward liquid flow velocity balances the particle terminal velocity.

show abstract

Section: Model Validationsupporting

confidence: 89%

Model of multiphase flow, superheat transport, and particle capture in a steel continuous caster

Liang

Cho

Ruan

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…The shell thickness profile was compared with predicted numerical results. The predicted results seem to have good agreement with the previous work of Cho et al [ 38 ].…”

Section: Numerical Detailssupporting

confidence: 89%

“…The species continuity equation was solved at each time step during the simulation’s two transient periods. The numerical model for molten steel solidification was validated with the numerical results of Cho et al [ 38 ], as shown in Figure 4 . The shell thickness profile was compared with predicted numerical results.…”

Section: Numerical Detailsmentioning

confidence: 99%

Simulation of Inclusion Particle Motion Behavior under Interfacial Tension in Continuous Casting Mold

Siddiqui

Albaqami²,

Arifudin³

et al. 2022

Materials

View full text Add to dashboard Cite

Inclusions entrapped by the solidifying front during continuous casting adversely affect the properties of the final steel products. In this study, we investigated the effect of the interfacial tension due to surfactant concentration, particularly sulfur, on alumina inclusion motion behavior during molten steel solidification in a continuous casting mold. A two-dimensional numerical model was developed in Ansys Fluent software to simulate the inclusion motion in a continuous casting mold. Further, the impacts of different values of the alumina inclusion diameter, sulfur concentration, and melt temperature were studied to understand the inclusion motion behavior. The inclusion diameter affected the inclusion distribution throughout the domain. The alumina inclusion entrapment percentage varied in the case of sulfur mixing (using an empirical relationship for modeling). It was found that the removal percentage varied according to the sulfur concentration. The addition of sulfur at concentrations from 10 ppm to 70 ppm resulted in a 4% increase in the removal of alumina inclusions (trapped in the solidifying shell), except for the 100-ppm case. Smaller-sized inclusion particles had a 25% higher chance of entrapment at the top level of the mold. Under the effect of a higher surface tension gradient between inclusions and the melt, the predicted findings show that inclusions were vulnerable to engulfment by the solidification front.

show abstract

“…Cho et al focused on studying the capture of inclusions in a steel slab caster with a vertical mold, including the top section, bending region, and curved lower strand. [ 6 ] Similarly, Liu and Li investigated inclusion transport in a vertical‐bending continuous slab caster using the LES model. [ 12 ] Pfeilier et al proposed a numerical model that integrated turbulent melt flow, the standard

k - \epsilon

model, columnar solidification, and particle transport to investigate entrapment and engulfment phenomena during solidification in a slab caster.…”

Section: Introductionmentioning

confidence: 99%

Transient Analysis of Fluid Flow, Solidification, and Inclusion Behavior in Electromagnetically Stirred Bloom Caster Mold Using Bifurcated Submerged Entry Nozzle

Kumar

Maurya

Jha

2023

steel research int.

View full text Add to dashboard Cite

Herein, the effect of bifurcated submerged entry nozzle (SEN) port angles on transient flow, solidification, and inclusion behavior in a bloom caster mold with electromagnetic stirring (EMS) is investigated. A 3D numerical model is developed to simulate the process, including time‐varying electromagnetic field and Lagrangian inclusion tracking approach, by varying inclusion density and size. The inclusion is modeled to be entrapped in the solidified shell when primary dendrite arm spacing (PDAS) is greater than inclusion size. As compared to the case without use of EMS, the percentage of shell thickness at the strand outlet is seen to increase by 22.18%, 9.45%, 8.03%, 9.31%, and 13.40% for different port angle values of 0°, 15°, 20°, 25°, and 30°, respectively, with EMS. The results show that EMS significantly influences the flow behavior by generating the swirl flow pattern that hinders the movement of inclusion downward in the domain. The bifurcated SEN with 30° port angle (without EMS) is seen to reduce inclusion entrapment and hence enhance inclusion removal. The outcome of present research may provide useful insights for optimizing the parameters of bloom caster mold to improve product quality, reduce production costs, and increase overall efficiency.

show abstract

Modeling of Inclusion Capture in a Steel Slab Caster with Vertical Section and Bending

Cited by 12 publications

References 33 publications

Model of multiphase flow, superheat transport, and particle capture in a steel continuous caster

Model of multiphase flow, superheat transport, and particle capture in a steel continuous caster

Simulation of Inclusion Particle Motion Behavior under Interfacial Tension in Continuous Casting Mold

Transient Analysis of Fluid Flow, Solidification, and Inclusion Behavior in Electromagnetically Stirred Bloom Caster Mold Using Bifurcated Submerged Entry Nozzle

Contact Info

Product

Resources

About