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Dynamic and equilibrium interfacial phenomena in liquid steel-slag systems

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Abstract

The equilibrium interfacial energy between a liquid iron alloy and a liquid slag is a key physical parameter in the design of steel-refining processes as high interfacial energies are desired to avoid emulsification of slag in steel and the creation of casting defects. During a chemical reaction between a liquid iron alloy droplet and a liquid slag, it is possible to observe by X-ray photography a number of dynamic interfacial phenomena such as droplet flattening, interfacial turbulence, and spontaneous emulsification that can potentially lead to serious processing problems. These dynamic phenomena have been studied during reactions between Fe-Al and Fe-Ti alloys and silica-containing slags, and the presence of significant interfacial disturbance has been observed during the times of high reaction rate between the slag and the metal. It is suggested that interfacial chemical reactions induce Marangoni and natural convection at the slag-metal interface. This interfacial flow gives rise to interfacial waves due to a Kelvin-Helmholtz instability. The waves grow, become unstable, and lead to spontaneous emulsification of slag in steel and steel in slag. Experiments using industrial samples and controlled laboratory tests have indicated that this phenomenon may be more common than once thought and could lead to some serious problems in the processing of steel alloys containing high quantities of aluminum and/or titanium.

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Author notes

  1. Y. Chung (formerly Graduate Student, Postdoctoral Fellow)

    Present address: Department of Materials Science and Engineering, Carnegie Mellon University, Canada

Authors and Affiliations

  1. Department of Metallurgy and Materials Science, University of Toronto, M53 3E4, Toronto, Canada

    Y. Chung (formerly Graduate Student, Postdoctoral Fellow)

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

    A. W. Cramb (Professor)

Authors
  1. Y. Chung
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  2. A. W. Cramb
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This article is based on a presentation made in the “Geoffrey Belton Memorial Symposium,” held in January 2000, in Sydney, Australia, under the joint sponsorship of ISS and TMS.

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Chung, Y., Cramb, A.W. Dynamic and equilibrium interfacial phenomena in liquid steel-slag systems. Metall Mater Trans B 31, 957–971 (2000). https://doi.org/10.1007/s11663-000-0072-5

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