About the Moving Phase Boundary Simulation

The growth of ferrite (bcc) into austenite (fcc) is simulated in this example. The austenite is assumed to be initially homogeneous with the composition Fe - 0.15 mass-% C and the transformation temperature is 1050 K. The initial thickness of the austenite is 2 mm and an initially very thin ferrite (1 nm) is also present at the start of the simulation. The initial state is as below.

The set up of the Moving Boundary example

The set-up of the Moving Boundary example. There are two regions, Ferrite and Austenite, consisting of bcc and fcc, respectively.

A schematic graph of the carbon profile during the transformation is shown in the image below. Crusius et al. [1992Cru-1] is recommended as further reading.

Schematic view of the carbon profile during the transformation from austenite to ferrite

Schematic view of the carbon profile during the transformation from austenite (g) to ferrite (a) in the Moving Boundary example.

Reference

[1992Cru-1] S. Crusius, L. Höglund, U. Knoop, G. Inden, J. Ägren, On the Growth of Ferrite Allotriomorphs in Fe - C Alloys / Das Wachstum von allotriomorphem Ferrit in Fe — C-Legierungen. Int. J. Mater. Res. (Zeitschrift für Met. 83, 729–738 (1992).