Abstract
The solubility of nitrogen in liquid chromium and chromium-iron alloys has been studied by a sampling method at the temperatures of 1550-1780°C and under 0.04-1.0atm of nitrogen.The equilibrium constant of the solution reaction and the activity of nitrogen in liquid chromium and chromium-iron alloys were determined by applying the interstitial model to the experimental results.The results obtained are summarized as follows:(1) Nitrogen dissolved in liquid chromium and chromium-iron alloys up to 50% Fe does not obey the Sieverts' law, and the solubility of nitrogen in liquid chromium is given by the following equation.log K(Z)=5515/T-3.193, K(Z)=aN/√ =ψNZN√ (2) The activity coefficients of nitrogen based on pure liquid chromium are expressed as follows:log ψNN(Cr)=(4235/T-1.513)•YN YN<0.21log ψFeN(Cr)=1.80•YFe YFe<0.7(3) The activity coefficients of nitrogen in liquid iron-chromium alloys based on pure liquid iron are shown by the following equations:log γCrN(Fe)=(-13765/T+3.10)•XCr XCr<0.16log fCrN(Fe)=(-148/T×0.033)•[%Cr] [%Cr]<15where, YN ZN: the mole ratio and the lattice ratio of nitrogen in the liquid metal, respectively.
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