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TECHNICAL PAPERS

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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References

Figures

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The phase boundary (α+γ/γ) in the ternary Fe-C -Mn system at different temperatures
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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.
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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.
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Unit cell of the two-phase composite during γ/α phase transformation. a denotes the austenite grainsize.
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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.
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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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