About the Critical Transformation Temperatures Property Model

The Critical Transformation Temperatures Property Model, available with the Property Model Calculator and the Steel Model Library, calculates critical transformation temperatures for steels under equilibrium conditions.

This Property Model can output the transformation temperatures for the following:

  • Liquidus: First austenite or ferrite transformation from the liquid
  • Solidus: Liquid fully transformed to solid
  • A0: Magnetic transition temperature (Curie temperature) of cementite. The cementite is paramagnetic above A0 and ferromagnetic below
  • A1: Austenite (FCC_A1) transforms to ferrite (BCC_A2) + carbide (cementite or graphite or M23C6)
  • A2: Magnetic transition temperature (Curie temperature) of ferrite (BCC_A2). Paramagnetic above A2 and ferromagnetic below
  • A3: Austenite (FCC_A1) transforms to ferrite (BCC_A2)
  • A4: Delta-ferrite (BCC_A2) transforms to austenite (FCC_A1)
  • Acem: Austenite (FCC_A1) transforms to cementite. Requires that the Suspend graphite checkbox is selected on the Configuration window, which it is by default.
  • Agraph: Austenite (FCC_A1) transforms to graphite. Requires that the Suspend graphite checkbox is NOT selected on the Configuration window, i.e. graphite is not suspended.

To run calculations with the Steel Models requires a valid maintenance license plus licenses for both the TCFE (version 9 and newer) and MOBFE (version 4 and newer) databases. Also see our website to learn more about the Steel Model Library and other related examples.

The input parameters are entered on the Configuration window for the Property Model Calculator and described in Critical Transformation Temperatures Property Model Settings.

For an example, see PM_Fe_04: Critical Temperatures.