Effect of Chromium on Nitrogen Solubility in Liquid Fe-Cr Alloys Containing 30 mass% Cr

The nitrogen solubility in liquid Fe-Cr alloys has been measured by the gas-liquid metal equilibration technique in the temperature range from 1873 to 1 973 K. The nitrogen dissolution follows the Siverts' law for liquid Fe-Cr alloys containing chromium up to 30 mass%. Chromium increased the nitrogen solubility linearly at Cr content less than 3 mass%, and the second-order effect of Cr on nitrogen solubility was apparent at higher Cr content. Using Wagner's formalism, the first- and second-order interaction parameters between chromium and nitrogen were determined from the equilibrium relation between chromium and nitrogen contents in liquid Fe-Cr-N alloys as a function of temperature: log f(N)(Cr) = (- 147.8/T+0.019)center dot[%Cr]+(-2.58/T+0.0021)center dot[%Cr](2) (0<mass%Cr<30)