Abstract
The rate of nitrogen dissolution into molten iron-M (M: Ti, Zr, V, and Cr) alloys at temperatures from 1873 to 2023 K has been measured using an isotope exchange reaction. The rate of nitrogen dissolution into molten iron is shown to increase by adding an element with a stronger affinity for nitrogen than Fe, such as Ti, Zr, V, and Cr. Of these, Ti increased the reaction rate most and the rate constant for the Fe-0.08 mass pct Ti alloy was 1.5 times larger as that for pure iron at 1873 K. The correlation of rate constant with thermodynamic interaction parameter with nitrogen was observed. This effect is discussed in terms of the change in the activity of the vacant site on the surface of the molten alloy.
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