The activity of chromium in molten Fe-Cr-C alloy was measured at 1 823 K using chemical equilibration technique in the dilute Cr concentration region. It was found that chromium in Fe-Cr-C alloy showed Henrian behavior up to 3 mass% Cr and that the activity coefficient of chromium at infinitely dilute solution in Fe-Cr alloy was 3.90 at 1 823 K. The effects of carbon on the activity coefficient of chromium at infinitely dilute solution in Fe-Cr-C alloy could be expressed as follows; In γ°Cr(S) = 1.29-7.09Xc at 1 823 K. There is little temperature dependence of the activity of chromium at carbon saturated condition. The standard Gibbs energy of mixing for Fe-Cr alloy, and Fe-Cr-Csatd alloy was calculated using the Gibbs-Duhem relationship. The results indicated that the affinity between chromium is larger than that of chromium for iron in Fe-Cr alloy. But the affinity between chromium and carbon is increased with increasing carbon.
|Number of pages||5|
|Journal||Journal of Engineering and Applied Science|
|Publication status||Published - 1998 Dec 1|
All Science Journal Classification (ASJC) codes