During continuous casting low alloy steels undergo a proeutectoid γ (austenite)/α (ferrite) transformation at temperatures of about 1000 K and above. The continuous rearrangement of the iron-lattice (fcc to bcc) is accompanied by diffusion of dissolved components (C, Mn). The diffusion coefficient of carbon exceeds that of a substitutionally dissolved element by a factor of to at these temperatures. Therefore, Mn-diffusion does not influence the γ/α phase transformation provided that the mole fraction of Mn and the transformation temperature are low enough. In this case the γ/α transformation in the Fe-C-Mn system finally reaches paraequilibrium rather than orthoequilibrium. The time-dependent driving force of the phase transformation has been evaluated as a function of temperature and composition. Furthermore, the growth kinetics of the ferrite phase was calculated by a numerical routine.
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January 2003
Technical Papers
Interaction of Phase Transformation and Diffusion in Steels
E. Gamsja¨ger,
E. Gamsja¨ger
Institut fu¨r Mechanik, Christian Doppler Laboratory—Functionally Oriented Material Design, Montanuniversita¨t Leoben, Franz-Josef-Str. 18, A—8700 Leoben, Austria
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F. D. Fischer,
F. D. Fischer
Institut fu¨r Mechanik, Christian Doppler Laboratory—Functionally Oriented Material Design, Montanuniversita¨t Leoben, Franz-Josef-Str. 18, A—8700 Leoben, Austria
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J. Svoboda
J. Svoboda
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zˇizˇkova 22, CZ—616 62 Brno, Czech Republic
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E. Gamsja¨ger
Institut fu¨r Mechanik, Christian Doppler Laboratory—Functionally Oriented Material Design, Montanuniversita¨t Leoben, Franz-Josef-Str. 18, A—8700 Leoben, Austria
F. D. Fischer
Institut fu¨r Mechanik, Christian Doppler Laboratory—Functionally Oriented Material Design, Montanuniversita¨t Leoben, Franz-Josef-Str. 18, A—8700 Leoben, Austria
J. Svoboda
Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Zˇizˇkova 22, CZ—616 62 Brno, Czech Republic
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division November 23, 2001; revision received June 2, 2002. Associate Editor: E. Werner.
J. Eng. Mater. Technol. Jan 2003, 125(1): 22-26 (5 pages)
Published Online: December 31, 2002
Article history
Received:
November 23, 2001
Revised:
June 2, 2002
Online:
December 31, 2002
Citation
Gamsja¨ger, E., Fischer, F. D., and Svoboda, J. (December 31, 2002). "Interaction of Phase Transformation and Diffusion in Steels ." ASME. J. Eng. Mater. Technol. January 2003; 125(1): 22–26. https://doi.org/10.1115/1.1525251
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