溶鉄の窒素溶解度および窒素溶解度におよぼす VI_a 族元素の影響

概要

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The solubility of nitrogen in liquid iron was studied at temperature from 1580° to 1730℃ by both the SIEVERTS' method and a sampling method. By improving the methods, the results obtained in the temperature range agreed with each other within the experimental errors. However, from the viewpoint of the temperature dependence of the solubility, the results obtained by the sampling method is more reliable on the solubility of nitrogen in liquid iron. The results obtained in liquid iron by the sampling method is expressed as follows : logK(≒[%N]/√<P_N_2>)=-518/T-1.063±0.0004 ⊿G°=237+4.85T±0.002T(cal/g-atm). The study was extended to the iron alloys containing the group VI_a elements at 1580℃ by the sampling method. Though all elements of the group VI_a were expected to decrease the solubility of nitrogen, oxygen showed the opposite effect on the solubility. The results obtained are expressed by log f^J_N as follows : log f^O_N=-0.12[%O]<0.12%O, log f^S_N=0.007[%S]<4%S log f^<Se>_N=0.006[%Se]<4%Se, log f^<To>_N=0.070[%Te]<0.6%Te.
社団法人日本鉄鋼協会の論文
1982-06-01