日本金属学会誌

J. Japan Inst. Metals, Vol. 32, No. 10 (1968),
pp. 933-938

Solubility of Nitrogen in Molten Fe-Ni and Fe-Cr Alloys

Harue Wada1, Kôki Gunji1 and Tsuguyasu Wada1

1National Research Institute for Metals, Tokyo

Abstract:

The solubility of nitrogen in liquid Ni, Cr and Fe-Ni, Fe-Cr systems has been measured in the temperature range from 1780° to 2200°C over wide composition ranges. The measurements were made by a levitation-melting method.
The solubility of nitrogen in Ni was very low and increased with increasing temperature. For the Fe-Ni system, it was decreased with increasing Ni content and increased with increasing temperature. The solubility of nitrogen in the Fe-Cr system was increased with increasing Cr content up to 4.1 wt% at 1900°C for pure Cr, and decreased with increasing temperature.
Values of the partial molar heat of solution Δ HN of nitrogen were determined. The Δ HN in the Fe-Ni system showed an approximately linear relation with the Ni concentration, while the relationship was not linear in the Fe-Cr system. Using a statistical-thermodynamical method, an equation was derived for expressing interaction parameter εN(X) in terms of the excess enthalpy and entropy, which could be determined from the solubility of each component. The equation provided a reasonable explanation for the linearity of Δ HN in the iron-poor absorber system.


(Received 1968/2/15)

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