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Observation of calcium aluminate inclusions at interfaces between Ca-treated, Al-killed steels and slags

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Abstract

The evolution of Al2O3-CaO inclusions on molten steel surfaces and at molten steel/slag interfaces was observed in-situ through a confocal scanning laser microscope (CSLM) equipped with a gold-image furnace. Depending on the slag chemistry, some of the initially liquid inclusions evolved into irregular Al2O3 or SiO2-enriched inclusions during the separation across the interface. Inclusions were found to cluster at specific locations at the steel/slag interface. Unlike capillary-depression-driven clustering, which is observed on molten steel surfaces, a weak repulsive force opposes fluid-flow-driven clustering at the steel/slag interface. After clustering, the irregular solid inclusions were observed to agglomerate to form large aggregates.

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Authors and Affiliations

  1. the Department of Metallurgy and Materials Engineering, K.U. Leuven, B-3001, Leuven, Belgium

    B. Coletti (Research Assistant) & B. Blanpain (Associate Professor)

  2. Ugine & AlZ, 3600, Genk, Belgium

    S. Vantilt (Student, Exchange Student, Quality Engineer)

  3. the Department of Materials Science and Engineering, Carnegie Mellon University, 15213, Pittsburgh, PA

    S. Sridhar (Assistant Professor)

Authors
  1. B. Coletti
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  2. B. Blanpain
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  3. S. Vantilt
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  4. S. Sridhar
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Additional information

This article is based on a presentation given in the Mills Symposium entitled “Metals, Slags, Glasses: High Temperature Properties & Phenomena,” which took place at The Institute of Materials in London, England, on August 22–23, 2002.

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Coletti, B., Blanpain, B., Vantilt, S. et al. Observation of calcium aluminate inclusions at interfaces between Ca-treated, Al-killed steels and slags. Metall Mater Trans B 34, 533–538 (2003). https://doi.org/10.1007/s11663-003-0021-1

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  • DOI: https://doi.org/10.1007/s11663-003-0021-1

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