Observation of calcium aluminate inclusions at interfaces between Ca-treated,Al-killed steels and slags |
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Authors: | B Coletti B Blanpain S Vantilt S Sridhar |
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Affiliation: | (1) the Department of Metallurgy and Materials Engineering, K.U. Leuven, B-3001 Leuven, Belgium;(2) Ugine & AlZ, 3600 Genk, Belgium;(3) the Department of Materials Science and Engineering, Carnegie Mellon University, 15213 Pittsburgh, PA |
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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.
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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