Abstract
Using the theory described in the preliminary publication, the isothermal grain growth of a low carbon, silicon-manganese bearing TRIP-steel has been studied. The austenitic grain size was established through the measurement of the mean linear intercept distance, which has been transformed into the real mean austenite grain size. A general model of the form d n =d 0 n +K 1 t exp(K 2 / T) was used and the coefficients n, Kl and K2 have been statistically determined. It has been demonstrated that for low annealing temperatures the value of n is situated around 6, whereas at high temperatures n rapidly drops and adopts a value of 2. This behaviour was related to the dissolution of the precipitates present in the austenitic matrix during the soaking treatments. The model delivers very good predictions for soaking temperatures up to 1200 °C. For higher temperatures, the deviations between the predicted grain size and the really measured one are higher.
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