Journal ArticleDOI
Refractory–Slag–Metal–Inclusion Multiphase Reactions Modeling Using Computational Thermodynamics: Kinetic Model for Prediction of Inclusion Evolution in Molten Steel
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TLDR
In this article, a multiphase reaction model was developed by integrating the refractory-slag, slag-metal, and metal-inclusion elementary reactions in order to predict the evolution of inclusions during secondary refining processes.Abstract:
The refractory–slag–metal–inclusion multiphase reaction model was developed by integrating the refractory–slag, slag–metal, and metal–inclusion elementary reactions in order to predict the evolution of inclusions during the secondary refining processes. The mass transfer coefficient in the metal and slag phase, and the mass transfer coefficient of MgO in the slag were employed in the present multiphase reactions modeling. The “Effective Equilibrium Reaction Zone (EERZ) Model” was basically employed. In this model, the reaction zone volume per unit step for metal and slag phase, which is dependent on the ‘effective reaction zone depth’ in each phase, should be defined. Thus, we evaluated the effective reaction zone depth from the mass transfer coefficient in metal and slag phase at 1873 K (1600 °C) for the desulfurization reaction which was measured in the present study. Because the dissolution rate of MgO from the refractory to slag phase is one of the key factors affecting the slag composition, the mass transfer coefficient of MgO in the ladle slag was also experimentally determined. The calculated results for the variation of the composition of slag and molten steel as a function of reaction time were in good agreement with the experimental results. The MgAl2O4 spinel inclusion was observed at the early to middle stage of the reaction, whereas the liquid oxide inclusion was mainly observed at the final stage of the refining reaction. The content of CaO sharply increased, and the SiO2 content increased mildly with the increasing reaction time, while the content of Al2O3 in the inclusion drastically decreased. Even though there is slight difference between the calculated and measured results, the refractory–slag–metal multiphase reaction model constructed in the present study exhibited a good predictability of the inclusion evolution during ladle refining process.read more
Citations
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I and i
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Journal ArticleDOI
Modification of Inclusions in Molten Steel by Mg-Ca Transfer from Top Slag: Experimental Confirmation of the ‘Refractory-Slag-Metal-Inclusion (ReSMI)’ Multiphase Reaction Model
Jae Hong Shin,Joo Hyun Park +1 more
TL;DR: In this paper, the effect of the ladle slag composition on the formation behavior of non-metallic inclusions in molten steel was investigated and the spinel inclusion was modified to form a liquid CaO-Al2O3-MgO-SiO2 inclusion.
Journal ArticleDOI
Kinetic Modeling of Nonmetallic Inclusions Behavior in Molten Steel: A Review
TL;DR: In this article, a detailed review of the kinetic modeling for the nucleation, size growth, and compositional evolution of nonmetallic inclusions in steel was extensively reviewed in the present article.
Journal ArticleDOI
CFD Investigation of Effect of Multi-hole Ceramic Filter on Inclusion Removal in a Two-Strand Tundish
TL;DR: In this article, a transient three-dimensional (3D) comprehensive numerical model has been developed to study the flow pattern, temperature distribution and residence time of the molten steel, as well as the elimination of inclusion in a full size two-strand tundish.
Journal ArticleDOI
Formation Mechanism of Oxide-Sulfide Complex Inclusions in High-Sulfur-Containing Steel Melts
Jae Hong Shin,Joo Hyun Park +1 more
TL;DR: In this article, the ReSMI multiphase reaction model was employed in conjunction with experiments to investigate the influence of slag composition and [S] content in the steel on the formation of oxide-sulfide complex inclusions.
References
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Journal ArticleDOI
I and i
TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Journal ArticleDOI
FactSage thermochemical software and databases - recent developments
Christopher W. Bale,Eve Bélisle,Patrice Chartrand,Sergei A. Decterov,Gunnar Eriksson,Klaus Hack,In-Ho Jung,Youn-Bae Kang,Jacques Melancon,Arthur D. Pelton,Christian Robelin,Stephan Petersen +11 more
TL;DR: Emphasis is placed on the new databases and the calculation and manipulation of phase diagrams and complex phase equilibria in the FactSage thermochemical software and databases.
Journal ArticleDOI
Control of MgO·Al2O3 Spinel Inclusions in Stainless Steels
Joo Hyun Park,Hidekazu Todoroki +1 more
TL;DR: In this paper, the problems caused by spinel inclusions, which affect practice as well as products were shown, and the formation mechanism of MgO·Al2O3 spinels is explained thermodynamically from the view points of chemistries of molten steels and slag compositions.
Journal ArticleDOI
A thermodynamic model for deoxidation equilibria in steel
TL;DR: For relattively dilute solutions of oxygen and a deoxidizer M (M=Al, Cr, Ca, Mg,...) in molten Fe, a thermodynamic model was proposed wherein the dissolved species are M*O associates as well as unassociated M and O atoms as discussed by the authors.
Journal ArticleDOI
Calcium Modification of Spinel Inclusions in Aluminum-Killed Steel: Reaction Steps
Neerav Verma,Neerav Verma,Petrus Christiaan Pistorius,Richard J. Fruehan,Michael S. Potter,Helmut G. Oltmann,Eugene B. Pretorius +6 more
TL;DR: In this paper, the authors studied the transient evolution of spinels in laboratory and industrial heats and found that spinels can be modified readily to liquid inclusions by a calcium treatment, which is a well-established way to modify solid alumina inclusions to liquid or partially liquid calcium aluminates.
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