Critical Transformation Temperatures Property Model Settings

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.

About the Critical Transformation Temperatures Property Model

For an example, see PM_Fe_04: Critical Temperatures.

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.

Configuration Settings

These settings are found on the Property Model Calculator when Critical Transformation Temperatures is selected under Steel Models.

When working in the Configuration window, click the Description tab for more information about the Model.

For the details about the Condition Definitions, Calculation Type, Timeout in minutes, Parallel Calculation, and other calculation associated settings, see Property Model Calculator: Configuration Window Settings.

Select the Calculate solidus and liquidus checkbox to calculate these temperatures.

Select the Calculate Ax temperatures checkbox to calculate A0, A1, A3, Acem, and Agraph temperatures. Typically, only one temperature of A3, Acem, and Agraph exists. See below for additional details about these temperatures.

  • 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, which it is by default)
  • Agraph: Austenite (FCC_A1) transforms to graphite (requires that the Suspend graphite checkbox is NOT selected, i.e. graphite is not suspended)

By default the Suspend graphite checkbox is selected and suspends the graphite phase. Click to clear the checkbox as needed to enable the graphite.

By default the Suspend gas checkbox is selected and suspends the gas phase. Click to clear the checkbox as needed.

By default the temperature search limits are automatically defined. Select the Manual temperature search limits checkbox to manually change the limits for the Lower temperature search limit, Upper temperature search limit, and Max temperature step. Is given in the same unit as the temperature in the Condition Definitions.

These settings are available when the Manual temperature search limits checkbox is selected.

In the Lower temperature search limit and Upper temperature search limit fields enter temperature values to search the lower and upper limits of transformation temperatures.

This setting is available when the Manual temperature search limits checkbox is selected.

In the Max temperature step field, enter the largest temperature step. This is most often reduced when changes in driving force or the amount of the phases indicate a phase transformation at a shorter temperature step.

Plot Renderer Settings

Plot Renderer and Plot Renderer: Configuration Settings

When setting up your calculation on the Plot Renderer and/or Table Renderer, the following axis variables are available for the conditions defined on the Property Model Calculator.

Output the transformation temperatures:

  • 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 or M7C3)
  • 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 (only possible if graphite is suspended)
  • Agraph: Austenite (FCC_A1) transforms to graphite (only possible if graphite is enabled)