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The effect of chromium on the activity coefficient of sulfur in liquid Fe−Cr−S alloys

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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 CrS , 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 CrS =−94.2/T+0.040 The first order enthalpy and entropy interaction coefficients are found to beh CrS =−430±70 ands CrS =−0.183±0.007 respectively. These results are in good agreement with recently published data.

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Dondelinger, J.G., Kay, D.A.R. & McLean, A. The effect of chromium on the activity coefficient of sulfur in liquid Fe−Cr−S alloys. Metall Trans 2, 3203–3208 (1971). https://doi.org/10.1007/BF02814973

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