溶融 Cr および溶融 Cr-Fe 合金の窒素溶解度

概要

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The solubility of nitrogen in liquid chromium and chromium-iron alloys has been studied by a sampling method at the temperatures of 1550°∿1780℃ and under 0.04∿1.0 atm of nitrogen. The free energy of solution and the activity of nitrogen in liquid chromium and chromium-iron alloys were determined by applying the interstitial model for the experimental results. The results obtained are summerized as follows : (1) Nitrogen dissolved in liquid chromium and chromium-iron alloys upto 50% Fe does not obey Henry's law, and solubility of nitrogen in liquid chromium is given by the following equation. log K(Z)=5515/T-3.19_3, K(Z)=α_N/√<P_<N_2>>=⩛_NZ_N/√<P_<N_2>> (2) Activity coefficients of nitrogen based on pure liquid chromium are expressed as follows : log ⩛^N_<N(Cr)>=(4235/T-1.51_3)・Y_N Y_N<0.21 log ⩛^<Fe>_<N(Cr)>=1.80・Y_<Fe> Y_<Fe><0.7 (3) Activity coefficients of nitrogen in iron-chromium alloys based on pure liquid iron are shown by the following equations : log γ^<Cr>_<N(Fe)>=(-13765/T+3.10)・X_<Cr> X_<Cr><0.16 log f^<Cr>_<N(Fe)>=(-148/T+0.033)・[%Cr] [%Cr]<15 Where Y_N and Z_N are the mole ratio and the lattice ratio of nitrogen in liquid metal respectively.
社団法人日本鉄鋼協会の論文
1983-06-01