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Matched thermochemical diagram for vacuum decarburization of ferroalloys

Dahilstedt, A and Ramanachalam, MS and Jacob, KT and Seetaraman, S (1993) Matched thermochemical diagram for vacuum decarburization of ferroalloys. In: Scandinavian Journal of Metallurgy, 22 (1). pp. 17-23.

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Official URL: http://onlinelibrary.wiley.com/journal/10.1111/%28...


The carbon content of high carbon ferroalloy melts can be reduced by a vacuum treatment. Carbon and oxygen dissolved in the melt react to form CO. Although this process has been suggested in the literature, no comprehensive analysis of the equilibrium partial pressure of CO over an alloy melt with a given carbon and oxygen content has been reported. In this paper, a new type of matched thermochemical diagram is introduced, from which the feasibility of decarburization at reduced CO pressure and the minimum achievable carbon level can be graphically evaluated for any alloy composition and temperature. Carbon and oxygen potentials of different alloys are plotted as functions of temperature on two terminal diagrams. By projecting information from these plots onto a central diagram, containing data on the Gibbs' energy of mixing for the C-O system, equilibrium partial pressures of CO and CO2 are obtained. Nomograms on the central diagram give a direct indication of the equilibrium partial pressures at any given temperature. The carbon and oxygen activities in ferrochromium alloys have been assessed and the results are presented to illustrate the construction and use of the matched thermochemical diagrams.

Item Type: Journal Article
Publication: Scandinavian Journal of Metallurgy
Publisher: John Wiley and Sons
Additional Information: Copyright of this article belongs to John Wiley and Sons.
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 11 Feb 2011 09:22
Last Modified: 11 Feb 2011 09:22
URI: http://eprints.iisc.ac.in/id/eprint/35533

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