Interaction of Phase Transformation and Diffusion in Steels

[+] Author and Article Information
E. Gamsjäger, F. D. Fischer

Institut für Mechanik, Christian Doppler Laboratory—Functionally Oriented Material Design, Montanuniversität Leoben, Franz-Josef-Str. 18, A—8700 Leoben, Austria

J. Svoboda

Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, CZ—616 62 Brno, Czech Republic

J. Eng. Mater. Technol 125(1), 22-26 (Dec 31, 2002) (5 pages) doi:10.1115/1.1525251 History: Received November 23, 2001; Revised June 02, 2002; Online December 31, 2002
Copyright © 2003 by ASME
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Grahic Jump Location
The phase boundary (α+γ/γ) in the ternary Fe-C -Mn system at different temperatures
Grahic Jump Location
Schematic molar Gibbs energy diagram. The tangent planes on the austenite and ferrite surface are intersected with the zero-carbon plane, resulting in the lines a and b and in the lines ape and bpe in case of paraequilibrium. The driving force is given as the distance between the two lines at the mole fraction XMnα.
Grahic Jump Location
Chemical driving force Δfchem in the Fe-C-Mn system at constant Fe/Mn ratio. The ratio of the Fe to Mn sites has been set to 98.5 and the initial mole fractions XC and XMn in γ are 0.005 and 0.01, respectively.
Grahic Jump Location
Unit cell of the two-phase composite during γ/α phase transformation. a denotes the austenite grainsize.
Grahic Jump Location
Comparison between the kinetics in a binary Fe-C alloy (XC=0.005) and a ternary Fe-C-Mn alloy (Initial mole fractions in γ: XC=0.005,XMn=0.01) at 800°C and a grainsize a of 20 μm.
Grahic Jump Location
Experimentally and theoretically obtained data on the growth kinetics of ferrite reported by Lee and Lee 24 compared to the results predicted by our numerical routine




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