| Summary: | Austenite grain growth kinetics have been studied in a Ti-Nb microalloyed low
carbon steel in the temperature range of 1100 to 1250°C, employing a Gleeble® 1500
thermomechanical simulator. No significant grain growth has been observed below
1100°C. The onset of grain growth at 1150°C, both normal and abnormal, is related to the
coarsening and dissolution of precipitates. This is confirmed and quantified by
transmission electron microscopy analyses. For this purpose, the statistical grain growth
model of Abbruzzese and Liicke is combined with the model by Cheng et al. for the
coarsening and dissolution of precipitates. An austenite grain growth model has been
developed which correlates the time and temperature dependence of the pinning force to
the dissolution kinetics of the Ti-Nb carbonitrides in the steel. The model predictions are
consistent with the experimental observations of grain size and particle size evolution. === Applied Science, Faculty of === Materials Engineering, Department of === Graduate
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