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.
Interaction of Phase Transformation and Diffusion in Steels
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.
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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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