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Title of Journal: Metall and Materi Trans B

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Abbravation: Metallurgical and Materials Transactions B

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Springer US

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DOI

10.1007/bf01968023

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1543-1916

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Thermodynamics of the Formation of MgOAlSubscrip

Authors: Joo Hyun Park SangBeom Lee Henri R Gaye
Publish Date: 2008/11/11
Volume: 39, Issue: 6, Pages: 853-861
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Abstract

The equilibration between CaOSiO2MgOAl2O3CaF2 TiO2 slag and Fe11 mass pct Cr ferritic stainless steel melts was investigated at 1873 K in order to clarify the effect of Al and Ti addition as well as that of slag composition on the formation of complex oxide inclusions The activity of oxygen calculated from the classical Wagner formalism changes from about a O = 00002 to 0001 and the values of a O from Al/Al2O3 and that from Si/SiO2 equilibria are in relatively good agreement with each other with some scatters The phase stability diagram of the inclusions and the equilibrium isoO lines in the Fe11 mass pct Cr05 mass pct Si03 mass pct Mn00005 mass pct Mg steel melts was constructed by using FACTSAGE 55 program as a function of Al and Ti contents The computed isoO lines were slightly larger than the values estimated from the slagmetal equilibria The composition of the inclusions could be plotted on the computed MgOAl2O3TiO x phase diagram The inclusions in the steel melts equilibrated with the basic slags are located in the “spinel + liquid” region while those in equilibrium with the less basic slags are mostly in the “liquid” single phase This is in good accordance to the observed morphology of the inclusions However in cases of high concentration of Ti and Al the inclusions were found to be spinel + liquid even though the less basic slags are equilibrated When plotted on logarithmic scales the mole ratio left X textMgO times X textAl text2 textO text3 mathordleft/ vphantom X textMgO times X textAl text2 textO text3 X textTi text2 textO text3 right kernnulldelimiterspace X textTi text2 textO text3 right of the inclusions spinel potential was expressed as a linear function of leftlfloor a textMg times a2 textAl times a textO mathordleft/ vphantom a textMg times a2 textAl times a textO a2 textTi right kernnulldelimiterspace a2 textTi rightrfloor of the steel melts with a slope of unity theoretically expected Also the spinel potential is very low and nearly constant when the activity of Al2O3 is less than that of TiO2 in the slag saturated by MgO whereas it linearly increases by increasing the log left a textAl text2 textO text3 mathordleft/ vphantom a textAl text2 textO text3 a textTiO text2 right kernnulldelimiterspace a textTiO text2 right at left X textAl text2 textO text3 mathordleft/ vphantom X textAl text2 textO text3 X textTiO text2 right kernnulldelimiterspace X textTiO text2 right 1

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  1. Measuring Mechanical Behavior of Steel During Solidification: Modeling the SSCC Test
  2. Investigation into Oxygen-Enriched Bottom-Blown Stibnite and Direct Reduction
  3. Morphological Changes of Panzhihua Ilmenite During Oxidation Treatment
  4. A Thermodynamic Model of Sulfur Distribution Ratio between CaO–SiO 2 –MgO–FeO–MnO–Al 2 O 3 Slags and Molten Steel during LF Refining Process Based on the Ion and Molecule Coexistence Theory
  5. Melting Mechanism of Water-Cooled Billet-Type Bottom Electrode of Direct Current Arc Furnace: A Numerical Approach
  6. Laboratory Carburization of Direct-Reduced Iron in CH 4 -H 2 -N 2 Gas Mixtures, and Comparison with Industrial Samples
  7. Predicting the Effect of Pouring Temperature on the Crystallite Density, Remelting, and Crystal Growth Kinetics in the Solidification of Aluminum Alloys
  8. A Critical Review of the Modified Froude Number in Ladle Metallurgy
  9. A Framework for Soft Sensing of Liquid Pool Length of Continuous Casting Round Blooms
  10. Conditions for the Efficient Crushing of the As-Cast Microstructure of 30Cr10Ni Duplex Stainless Steel
  11. Coating tungsten composites for improved low temperature ductility
  12. Vaporization Studies from Slag Surfaces Using a Thin Film Technique
  13. Analysis of Microstructure Effects on Edge Crack of Thin Strip During Cold Rolling
  14. Separation of Phosphorus- and Iron-Enriched Phase from CaO-SiO 2 -FeO-MgO-P 2 O 5 Melt with Super Gravity
  15. A Study for Initial Solidification of Sn-Pb Alloy during Continuous Casting: Part I. The Development of the Technique
  16. An investigation of the validity of certain tempering parameters
  17. Chemical diffusion in the β phase of the Zr-Ti alloy system
  18. Morphology Control for Al 2 O 3 Inclusion Without Ca Treatment in High-Aluminum Steel
  19. A Semi-empirical Mathematical Model to Estimate the Duration of the Atmosphere within a Double Oxide Film Defect in Pure Aluminum Alloy
  20. Thermal Conductivity of Molten Silicate of Al 2 O 3 -CaO-Na 2 O-SiO 2 Measured by Means of a Front Heating-Front Detection Laser Flash Method
  21. New integration of the Gibbs-Duhem equation and thermodynamics of Pr-Zn alloys
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  23. Freeze-Lining Formation of a Synthetic Lead Slag: Part II. Thermal History
  24. Preparation and Thermal Stability of Ultrafine Nickel Powders Containing hcp-Ni Nanocrystallites Using Liquid-Phase Reduction Method
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  26. Kinetics of Na 2 O and B 2 O 3 Loss From CaO-SiO 2 -Al 2 O 3 Slags
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  29. A Mechanism Model for Raceway Formation and Variation in a Blast Furnace
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