PM_Fe_09: Fe-C-Ni Ferrite

The example uses the Property Model Calculator and the Ferrite Property Model to calculate the ferrite fraction parabolic rate constant and ferrite start time for an Fe-0.12C-3.28Ni alloy.

Two growth modes—Orthoequilibrum (OE) and Paraequilibrium (PE)—are used with a One Axis calculation type to compare the ferrite molar fraction and to determine the ferrite start time for each growth mode.

The experimental data for the ferrite start is taken from [1966Aar]. For the parabolic rate constant experimental data is from [1981Bra].

For more information about the Property Model, see About the Ferrite Property Model and Ferrite Property Model Settings.

  • Folder: Property Models → Steel
  • File name: PM_Fe_09_Fe-C-Ni_Ferrite.tcu

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.

Visualizations

Many of our Graphical Mode examples have video tutorials, which you can access in a variety of ways. When in Thermo‑Calc, from the menu select Help → Video Tutorials, or from the main My Project window, click Video Tutorials. Alternately, you can go to the website or our YouTube channel.

Open the example project file to review the node setup on the Project window and the associated settings on the Configuration window for each node. For some types of projects, you can also adjust settings on the Plot Renderer Configuration window to preview results before performing the simulation. Click Perform Tree to generate plots and tables to see the results on the Visualizations window.

When you run (Perform) this example, it takes a few minutes for the calculations to complete.

Ferrite fraction at the end of the transformation, under orthoequilibrium (OE) or paraequilibrium (PE).

Figure 1: Ferrite fraction at the end of the transformation, under orthoequilibrium (OE) or paraequilibrium (PE).

Parabolic rate constant. Experimental data is from [1981Bra].

Figure 2: Parabolic rate constant. Experimental data is from [1981Bra].

Ferrite start time. This plot also uses the TTT mode. Experimental data from [1966Aar].

Figure 3: Ferrite start time. This plot also uses the TTT mode. Experimental data from [1966Aar].

References

[1966Aar] H. I. Aaronson, H. A. Domian, Partition of alloying elements between austenite and proeutectoid ferrite or bainite. AIME MET SOC TRANS. 236, 781–796 (1966).

[1981Bra] J. R. Bradley, H. I. Aaronson, Growth kinetics of grain boundary ferrite allotriomorphs in Fe-C-X alloys. Metall. Trans. A. 12, 1729–1741 (1981).