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, Widmanstatten 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.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
