4.5 Article

Application of phase equilibrium studies of CaO-SiO2-Al2O3-MgO system for oxide inclusions in Si-deoxidized steels

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.calphad.2019.101721

Keywords

Phase equilibria; Liquidus temperature; FactSage prediction; Inclusion

Funding

  1. Australian Government through the Australian Research Council Research Hub for Computational Particle Technology
  2. University of Queensland International Research Tuition Award
  3. China Scholarship Council
  4. Baosteel through Baosteel-Australia Joint Research and Development Centre

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In the steelmaking process, the compositions of the oxide inclusions could be modified by refining slags to a large extent. The chemistries of the oxide inclusions and refining slags can be described by the system CaO-SiO2-Al2O3-MgO. Phase equilibria and liquidus temperatures in this system have been experimentally investigated in the composition and temperature ranges related to the oxide inclusions and refining slags by means of high-temperature equilibration, quenching and electron probe X-ray microanalysis. Isotherms in the interval of 20 degrees C between 1260 and 1560 degrees C were determined in the primary phase fields of wollastonite, anorthite, spinel, and melilite. Effects of the mass ratio of (Al2O3+SiO2)/((Al2O3+SiO2)+(CaO+SiO2)) and MgO content on the liquidus temperatures have been discussed to assist inclusion control. To obtain the lowest liquidus temperature of Al2O3-SiO2-CaO-MgO system inclusions, refining time ought to be properly controlled.

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