Abstract
The activity of oxygen dissolved in liquid iron-chromium alloy was determined by measuring the equilibrium of the reaction between dissolved oxygen in liquid alloy and H2-H2O gas mixture. The experiments were carried out at 1600°C up to 30% chromium. The effect of chromium on the activity coefficient of oxygen was represented by the following equation: logf_O(%)^Cr = -8.01 ·N_Cr + 5.82 ·N_Cr^1.2, N_Cr < 0.3, 1600°C. In the range 0∼10%Cr, the data were represented approximately by eOCr=−0.047. The gas ratio of H2-H2O mixture in equilibrium with liquid iron-chromium alloy and solid oxide phases was measured at 1600°C up to 20% chromium. Using the data on the equilibrium gas ratio and the activity of oxygen in liquid iron-chromium alloy, the solubility of oxygen was thermodynamically calculated. The results were in good agreement with the work of Chipman(5).
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