Analysis of R. P. Smith's and D. C. Parris-R. B. Mclellan's carbon diffusivity data |
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Authors: | Jar Kučera K Stránský |
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Institution: | (1) Institute of Physical Metallurgy, Czechosl. Acad. Sci, Brno, ikova 22, 616 62 Brno, Czechoslovakia |
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Abstract: | A phenomenological model is proposed to account for the variation of carbon diffusivityD(N1) with composition in austenite. This model is based on Parris-McLellan's statement that the increase ofD(N1) with carbon concentrationN
1 is due to the increase in chemical driving force. The gradient of the carbon activity in Wagner's and in Zupp-Stevenson's interpretation is presumed to be the intrinsic driving force. The predictions of the model are compared with carbonD(N1) values both with 1] and without 5] a chemical concentration gradient. TheD(0) values and the carbon-carbon interaction coefficients
1 are calculated by the use of the least squares method from the experimental data. The application of Zupp-Stevenson's definition of the activity coefficient
1 results in a better fit of the theory to the experimental data. |
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