General Models

Six general models are included in Thermo-Calc to help users to quickly set up some of the more common calculations using the Property Model Calculator.

Explore the types of property models included with Thermo-Calc and follow the links to more information:

General Property Models Available in Thermo-Calc

  • Coarsening model - calculates the coarsening rate coefficient K (m3/s) of a spherical precipitate phase in a matrix phase. 
  • Phase transitional model - calculates the point when a new phase may form by varying set conditions. The model is useful to determine melting temperature, boiling temperature or solubility limits. It returns the phase transformation temperature, or composition, depending on the varied condition. 
  • Driving force model - calculates the thermodynamic driving force for a phase. 
  • Interfacial energy model - estimates the interfacial energy between a matrix phase and a precipitate phase using thermodynamic data from a CALPHAD database.
  • Equilibrium model - calculates the equilibrium for the given conditions. Optionally define additional Function Definitions. 
  • Liquidus and solidus model - this model offers a fast and easy way to complete this common calculation. For example, you can easily use uncertainty calculations, varying one or more conditions, and see how that affects the liquidus and solidus temperatures. It is available in Thermo-Calc 2017a and newer.

Users can evaluate models simultaneously over a range of compositions and cross plot the results, then conduct an uncertainty analysis and plot the results as either a histogram (as shown below) or as a probability plot.  

Software Histogram


General Model Examples Available in Thermo-Calc

Thermo-Calc includes the following examples to help you get started using the Property Model Calculator. All examples can be run in the DEMO version of Thermo-Calc: 

  • PM_G_01: Phase Transitionpredicts the transition temperature to the unwanted brittle σ-phase and shows how the temperature is influenced by changes to a steel alloy’s composition using the uncertainty calculation type and either a histogram or probability plot.
  • PM_G_02: Coarsening and Interfacial Energyuses the Property Model Calculator and both thermodynamic (FEDEMO) and kinetic (MFEDEMO) demonstration steel databases to calculate the coarsening rate and interfacial energy of the carbide M23_C6.
  • PM_G_03: Driving Force and Interfacial Energy - uses the grid calculation type to produce a contour plot comparing the driving force and interfacial energy of the carbide M23C6.

Open the Examples and Search for Information in the Thermo-Calc Help

To open the example files described above, go to Help > Example Files > Property models > General. Double click on any of the files to load them into Thermo-Calc. 

You can also find more information about the property models in the Help included with your software. From within Thermo-Calc, press F1 or from the menu select Help > Online Help and then search for Property Model Calculator or any other search term relevant to your query. You can access the examples from the Help menu in Thermo-Calc.

General Model Examples Videos

Videos have been made for each of the General Model examples showing users how to set up the calculations and what the results mean.

View the videos on our YouTube page »

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