Austenite-to-pearlite isothermal decomposition mechanisms in a 0.44C-0.73Mn steel
DOI:
https://doi.org/10.3989/revmetalm.1161Keywords:
Isothermal decomposition of austenite, Interlamellar spacing, Divergent pearlite, Kinetics of pearlitic formationAbstract
The goal of this paper is to determine the austenite-to-pearlite isothermal decomposition mechanisms in a 0.44C-0.73 Mn steel. More precisely, the role of austenitizing temperature (Tγ), and hence the austenitic grain size (AGS), in the kinetics of pearlite formation has been studied. Results allow us to conclude that the average size of pearlitic colonies is increased as the AGS is increased. On the other hand, it appears that the interlamellar spacing of the pearlite does not depend on the Tγ but is controlled by the isothermal decomposition temperature of austenite (T). Finally, it was found that formation of pearlite is triggered for small AGS values and isothermal decomposition temperature regimes where the predominant controlling mechanism is due to carbon volume diffusion.
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