New Contribution to the Thermodynamics of Fe-Cr Alloys as Base for Ferritic Steels |
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Authors: | G Bonny D Terentyev L Malerba |
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Affiliation: | 1.SCK·CEN, Nuclear Materials Science Institute,Mol,Belgium |
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Abstract: | High chromium ferritic-martensitic steels are commonly used for industrial applications requiring high strength at elevated
temperature. Such steels typically contain 9-14 at.% Cr and a few percents of minor alloying elements. In recent studies it
has been shown that the Cr solubility limit of the standard Fe-Cr phase diagram in that composition range is significantly
underestimated. For the purpose of more reliable engineering and out of physical considerations, we reparameterize the Gibbs
free energy so that the correct Cr solubility at low temperature (<700 K) is reproduced, while leaving the rest of the phase
diagram changed only slightly. The mixing enthalpy and heat capacity resulting from the new parameterization are also compared
with experiments and found to be in good agreement. |
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