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Studies of the interfacial kinetics of the reaction of nitrogen with liquid iron by the15N-14N isotope exchange reaction

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Abstract

The rate of dissociation of N2 on high purity liquid iron and iron-sulfur alloys between 1550 and 1650 °C has been studied by means of the15N-14N exchange reaction. It is shown that the rate constants at given sulfur concentrations are consistent with those for the absorption of nitrogen into iron-sulfur alloys, indicating a common rate determining step. The rate constant for high purity liquid iron, in units of mol cm−2 s−1 aim−1, is given by: logk f = −340/T − 1.38. The rate constant is found to be independent of carbon concentration up to about 4.3 wt pct and to be closely consistent with ideal chemisorption kinetics. The results are combined with those of previously published studies to give rational equations for the apparent rate constants for Fe-S and Fe-O alloys. Consistent values for the adsorption coefficients at 1600 °C for sulfur and oxygen are deduced to be about 130 and 220, respectively, for a standard state of the 1 wt pct ideal solution.

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Authors and Affiliations

  1. Homer Research Laboratories, Bethlehem Steel Corporation, Bethlehem, PA

    M. Byrne

  2. Central Research Laboratories, The Broken Hill Proprietary Company Ltd., Shortland, New South Wales, Australia

    G. R. Belton (Director, Adjunct Professor, Honorary Professor)

  3. Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, PA

    G. R. Belton (Director, Adjunct Professor, Honorary Professor)

  4. Department of Metallurgy, University of Newcastle, New South Wales, Australia

    G. R. Belton (Director, Adjunct Professor, Honorary Professor)

Authors
  1. M. Byrne
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  2. G. R. Belton
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Formerly with the Department of Materials Science and Engineering, University of Pennsylvania

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Byrne, M., Belton, G.R. Studies of the interfacial kinetics of the reaction of nitrogen with liquid iron by the15N-14N isotope exchange reaction. Metall Trans B 14, 441–449 (1983). https://doi.org/10.1007/BF02654363

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  • DOI: https://doi.org/10.1007/BF02654363

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