Abstract
A dilatometric study of the isothermal phase transformations in a low-alloy carbon steel is presented. The results show a TTT diagram consisting of three C shaped curves corresponding respectively to allotriomorphic ferrite-pearlite, Widmanstätten ferrite-pearlite and bainite transformations. These three temperature intervals are even better marked in a plot of total dilatation against temperature. A representation of log (ΔI/I) against logt, at each holding temperature, gives information about the transformations taking place. Hence, it is suggested that the bainitic reaction also occurs in two consecutive stages. Similarly to the other two transformations, ferrite formation in the initial stage is followed by the subsequent precipitation of cementite and further ferrite. It is concluded that the three transformations are of similar nature, controlled by carbon diffusion, the different C-curves being produced by changes either in the growth or nucleation mechanisms.
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Prado, J.M., Catalan, J.J. & Marsal, M. Dilatometric study of isothermal phase tranformation in a C-Mn steel. J Mater Sci 25, 1939–1946 (1990). https://doi.org/10.1007/BF01045746
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DOI: https://doi.org/10.1007/BF01045746