Fe-28%Ni オーステナイトに 1000℃で固溶した窒素の活量に及ぼすクロムの影響  [in Japanese] The Effect of Chromium on the Activity of Nitrogen in Fe-28%Ni Austenite at 1000℃  [in Japanese]

A capsule technique was employed to investigate the effect of chromium on the activity of nitrogen in Fe-28%Ni-Cr-N austenite at 1000℃ in a high chromium concentration range between 15 and 30%. The activity of nitrogen in the system is adequately described by the following equation : log a_N=log (%N)+e^<Cr>_N(%Cr)+e^<Ni>_N(%Ni)+r^<Cr>_N(%Cr)^2+r^<Cr, Ni>(%Cr)(%Ni), where numerical values for e^<Cr>_N and e^<Ni>_N are evaluated from the data in Fe-Cr-N and Fe-Ni-N systems, respectively. The values of the secnd order interaction parameters, r^<Cr>_N and r^<Cr, Ni>, determined in the present investigation, are 0.0021_3 and -0.0003_3, respectively, at 1000℃.