Activities of Chromium in Molten Fe-Cr-C Alloy

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著者

    • PARK Jung-Ho
    • Graduate Student, Pohang University of Science and Technology
    • RHEE Chang-Hee
    • Department of Materials Science and Engineering, Pohang University of Science and Technology

抄録

The activity of chromium in molten Fe–Cr–C alloy was measured at 1823 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 1823 K. <br>The effects of carbon on the activity coefficient of chromium at infinitely dilute solution in Fe–Cr–C alloy could be expressed as follows;<br><br>ln γ<sub>Cr(S)</sub><sup>o</sup>=1.29–7.09<I>X</I><sub>C</sub>   at 1823 K <br><br>There is little temperature dependence of the activity of chromium at carbon saturated condition. <br> The standard Gibbs energy of mixing for Fe–Cr alloy and Fe–Cr–C<sub>satd</sub> 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.

収録刊行物

  • ISIJ international

    ISIJ international 38(12), 1287-1291, 1998-12-15

    The Iron and Steel Institute of Japan

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