Motion and Detachment Behaviors of Liquid Inclusion at Molten Steel–Slag Interfaces

Xuan, Changji; Persson, Ewa Sjöqvist; Sevastopolev, Ruslan; Nzotta, Mselly

doi:10.1007/s11663-019-01568-2

Cited by 24 publications

(33 citation statements)

References 53 publications

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“…The calculation is considered to be converged within each time step when the residuals decrease below 10 −4 . Relevant values for two fluids and the interfacial property come from the literature (Xuan et al, 2019) and are listed in Table 1. For the steel-slag system, a reference simulation is performed initially.…”

Section: Simulation Setup and Case Descriptionmentioning

confidence: 99%

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Zhang

Pirker

Saeedipour

2022

Exp. Comput. Multiph. Flow

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The capillary interactions are prominent for a micro-sized particle at the steel—slag interface. In this study, the dynamics of a spherical particle interacting with the steel—slag interface is numerically investigated using the volume of fluid method in combination with the overset grid technique to account for particle motion. The simulations have shown the particle’s separation process at the interface and successfully captured the formation and continuous evolution of a meniscus in the course of particle motion. A sensitivity analysis on the effect of different physical parameters in the steel—slag—particle system is also conducted. The result indicates that the wettability of particle with the slag phase is the main factor affecting particle separation behavior (trapped at the interface or fully separated into slag). Higher interfacial tension of fluid interface and smaller particle size can speed up the particle motion but have less effect on the equilibrium position for particle staying at the interface. In comparison, particle density shows a minor influence when the motion is dominated by the capillary effect. By taking account of the effect of meniscus and capillary forces on a particle, this study provides a more accurate simulation of particle motion in the vicinity of the steel—slag interface and enables further investigation of more complex situations.

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Section: Simulation Setup and Case Descriptionmentioning

confidence: 99%

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Zhang

Pirker

Saeedipour

2022

Exp. Comput. Multiph. Flow

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“…According to Xuan et al [37], the most important factors for an inclusion to be captured in a process slag are its size and flotation speed in the steel. According to this proposal, in the case of a vacuum-treated steel shop charge, with different slag compositions and movements of the steel, inclusions larger than approximately 20 µm in diameter should be captured in the process slag.…”

Section: Figurementioning

confidence: 99%

Impact of Solidification on Inclusion Morphology in ESR and PESR Remelted Martensitic Stainless Steel Ingots

Persson¹,

Brorson²,

Mitchell

et al. 2021

Metals

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This study focuses on the impact of solidification on the inclusion morphologies in different sizes of production-scale electro-slag remelting (ESR) and electro-slag remelting under a protected pressure-controlled atmosphere, (PESR), ingots, in a common martensitic stainless steel grade. The investigation has been carried out to increase the knowledge of the solidification and change in inclusion morphologies during ESR and PESR remelting. In order to optimize process routes for different steel grades, it is important to define the advantages of different processes. A comparison is made between an electrode, ESR, and PESR ingots with different production-scale ingot sizes, from 400 mm square to 1050 mm in diameter. The electrode and two of the smallest ingots are from the same electrode charge. The samples are taken from both the electrode, ingots, and rolled/forged material. The solidification structure, dendrite arm spacing, chemical analyzes, and inclusion number on ingots and/or forged/rolled material are studied. The results show that the larger the ingot and the further towards the center of the ingot, the larger inclusions are found. As long as an ingot solidifies with a columnar dendritic structure (DS), the increase in inclusion number and size with ingot diameter is approximately linear. However, at the ingot size (1050 mm in diameter in this study) when the center of the ingot converts to solidification in the equiaxial mode (EQ), the increase in number and size of the inclusions is much higher. The transition between a dendritic and an equiaxial solidification in the center of the ingots in this steel grade takes place in the region between the ingot diameters of 800 and 1050 mm.

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“…Acidic modifying agents (SiO 2 -containing materials) are typically added to the steel slag after reduction as such materials can alter its viscosity, acidity coefficient (the mass fraction ratio of all acidic and alkaline substances in the slag), crystallization behavior, and other physical and chemical properties. [6][7][8] However, controlling the dissolution rate and homogenization behavior of the modifying agent remains an issue as it affects the fiber quality as well as the productivity and energy consumption. 9,10) Therefore, in order to optimize the production capacity of steel slag production, it is important to study the dissolution kinetics and mechanism of the modifying agent in the molten slag.…”

Section: Introductionmentioning

confidence: 99%

“….......................... (6). where D is the diffusion coefficient of SiO 2 particles in molten steel slag, which is a function of the slag temperature and viscosity according to the Stokes-Einstein relation:15,18,21) ............................ (7).…”

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confidence: 99%

Dissolution Mechanism of Modifying Agent in Fibrotic Process of Steel Slag

2021

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The kinetic behavior of SiO 2 dissolving in molten steel slag at 1 773-1 923 K was studied using a combination of high-temperature confocal scanning laser microscopy and a synthetic physical property tester. The experimental results showed that the change in slag electrical conductivity can characterize the homogenization process of the modifying agent in molten steel slag, and the dissolution process of the modifying agent is controlled by solute diffusion in the slag. The concentration difference between the boundary layer and the bulk of the slag is the primary driving force of the dissolution process. By increasing the reaction temperature, the SiO 2 particle dissolution rate in slag can be significantly increased. Moreover, the experimental data and model calculations revealed that the SiO 2 dissolution rate was the fastest when the total Fe (T.Fe) content was 14% and the acidity coefficient (M k ) was 1.5. The dissolution factors were defined to quantitatively evaluate the dissolution mechanism of particle by studying the dissolution process of slag with different components.

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Motion and Detachment Behaviors of Liquid Inclusion at Molten Steel–Slag Interfaces

Cited by 24 publications

References 53 publications

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Numerical investigation of particle motion at the steel—slag interface in continuous casting using VOF method and dynamic overset grids

Impact of Solidification on Inclusion Morphology in ESR and PESR Remelted Martensitic Stainless Steel Ingots

Dissolution Mechanism of Modifying Agent in Fibrotic Process of Steel Slag

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