FactSage was introduced in 2001 and is the fusion of the FACT-Win/F*A*C*T and ChemSage/SOLGASMIX thermochemical packages that were founded over 25 years ago. Petersen** * CRCT - Center for Research in Computational Thermochemistry École Polytechnique (Université de Montréal), Box 6079, Station Downtown, Montréal, Québec, CANADA H3C 3A7 ** GTT-Technologies, Kaiserstrasse 100, 52134 Herzogenrath, GERMANY (Received February 14, 2002) Abstract This paper presents a summary of the FactSage thermochemical software and databases. Science and Technology of Advanced Materials 17, 210 (2016).Calphad, Vol. Interestingly, even highly non-equilibrium processes such as vapor phase condensation can be modelled on the basis of a paraequilibrium, please check the following two open access publications: Chang et al. For Fe-Cr-C steels to calculate a metastable phase formation diagram where only carbides are allowed to form that exhibit the same Fe/Cr ratio as the matrix. Since the martensite formation is a diffusionless transformation, we have now calculated an upper bound for the marteniste start temperature: Only below the blue line it will be possible to form martensite! For multicomponent systems it would also be possible to allow one element to be mobile while the others are not, e.g. This line is integrated in blue into the phase diagram: Martensite is a body-centered tetragonal crystal structure (BCT), that is similar in Gibbs energy to the BCC phase but less stable (otherwise it would be present in the phase diagram). The result is a single line where the Gibbs energies of the austenite (FCC) and ferrite (BCC) are equal.
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