The effect of chromium on the activity coefficient of sulfur in liquid Fe−Cr−S alloys |
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Authors: | J. G. Dondelinger D. A. R. Kay A. McLean |
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Affiliation: | (1) Continental Alloys, SA, Dommeldange, Luxembourg;(2) Department of Metallurgy and Materials Science, McMaster University, Hamilton, Ontario;(3) Department of Metallurgy and Materials Science, University of Toronto, Toronto, Ontario |
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Abstract: | The effect of chromium on the activity coefficient of sulfur in the ternary system Fe−Cr−S has been determined in the temperature range 1525° to 1755°C for chromium concentrations of up to 40 wt pct, using a levitation melting technique in H2−H2S atmospheres. The first order free energy interaction coefficient,e S Cr , which is derived on the assumption that the thermal diffusion error is constant for both binary Fe−S and ternary Fe−Cr−S melts under controlled levitation conditions, is given by the relationship:e S Cr =−94.2/T+0.040 The first order enthalpy and entropy interaction coefficients are found to beh S Cr =−430±70 ands S Cr =−0.183±0.007 respectively. These results are in good agreement with recently published data. |
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