On the Activities of Cr and C in Molten Fe-C-Cr Alloys
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By constructing the following electrode concentration cell, the author measured the e.m.f. corresponding to the change in Cr and C in Fe-C-Cr alloys at about 1, 540℃ : 【○!-】 Fe, Cr|SiO_2, CaO, Cr-oxide, MgO|Fe. Cr, C 【○!+】 From the following equation the activity of Cr in this alloys was determined for the range of Cr<30% and 0<C<Sat., E=-10^<-4>T log α_<Cr> Fe-Cr binary alloys obey Raoult's law but Fe-C-Cr alloys show gradually negative deviation from Raoult's law on the addition of C, and the effect of C on the activity coefficient of Cr was discussed by using interaction parameter γ^C_<Cr> In addition, the effect of Cr on the activity coefficient of C was also discussed. Furthermore, the behaviors of Cr-oxide in molten slag were considered from oxygen potential which controls the system. And the decarburization limit in Fe-C-Cr alloys was calculated from experimental results.
- 東北大学の論文
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