Observations of crystallization in mold slags with varying Al 2O3/SiO2 ratio

Z. T. Zhang, G. H. Wen, J. L. Liao, S. Sridhar

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44 Scopus citations


The present paper is an investigation into how the Al2O 3/SiO2 ratio in the compositions of mold slags influences the crystallization behavior of molten slags. The experimental work is based upon observing the crystallization events through a Confocal Scanning Laser Microscope equipped with a hot-stage. The study is motivated by the variation in crystallization that might occur in mold slags due to the pickup of alumina during continuous casting of high Al containing TRIP steels. The crystallization temperature was found to increase with increasing Al2O 3/SiO2 ratio, and the crystal morphology was dependent upon the chemical composition and isothermal temperature. The crystallization path was complex, with CaF2 found to precipitate first, and followed by a second precipitation event. In this second event, the precipitated phase depended on the chemical composition of mold slag and changed from cuspidine to gehlenite as the mass ratio of Al2O3/SiO2 was increased beyond 0.65, and finally Al2O3 was observed when the alumina content was 30wt.% (corresponding to a mass ratio of m Al2O3/mSiO2=1.42).

Original languageEnglish (US)
Pages (from-to)516-528
Number of pages13
JournalSteel Research International
Issue number7
StatePublished - Jul 2010
Externally publishedYes


  • Crystallization
  • Mold slags
  • TRIP steels

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry


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