Auinger, Michael (2013) Phase diagrams with FACTSage - speaking different languages for thermochemical properties. In: GTT Annual Workshop 2013, Herzogenrath, Aachen, Germany, 3-5 Jul 2013

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Abstract

Thermochemical modelling offers a wide range of possibilities to understand and visualise
the existence of stable phases under various process conditions of interest. By making use
of the basic thermodynamic properties heat capacity, reaction enthalpies, Gibbs free
energies, FactSage proved to be extremely efficient for phase diagram calculations and
determining phase stabilities.
However, many different “styles” of visualising thermochemistry data can be found, which
often complicates a direct comparison of obtained results with available literature. In common
phase diagrams (e.g. the iron-carbon phase diagram), the concentration is plotted on the
abscissa and the temperature represents the ordinate.
Beside their frequent use for solid and liquid mixtures, it appears to be very uncommon to
see such diagrams for the interaction between a gaseous phase and a solid material.
Research in the field of metal-gas interactions often refers to phase stabilities, displayed in
an Ellingham-Richardson style which uses an energy scale instead of (molar) composition.
Although identical thermochemical values have been used, the results emphasise totally
different parameter ranges of interest.
Beside the frequent use of Ellingham-Richardson diagrams for high temperature
applications, especially in steel industry and for tool hardening, this presentation emphasises
on the visualisation and translation of thermochemistry data into common diagram styles.
The presentation further draws the listener's attention to the many possibilities of
thermochemical modelling in FactSage and helps to narrow the logical gap between different
graphical representations of thermochemical data.

Item Type:	Conference Item (Speech)
Divisions:	Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Official Date:	2013
Dates:	Date Event 2013 Completion
Status:	Not Peer Reviewed
Conference Paper Type:	Speech
Title of Event:	GTT Annual Workshop 2013
Type of Event:	Workshop
Location of Event:	Herzogenrath, Aachen, Germany
Date(s) of Event:	3-5 Jul 2013
Related URLs:	Other

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