Abstract
The process of dynamic recrystallization of bulb flat steel was simulated by the hot compression tests at a deformation temperature ranging of 950 to 1200 °C and strain rate ranging of 0.02 to 5 s−1, which is also the rolling speed and temperature range of the large-sized bulb flat steel. The results show that the PAGs increases gradually with the increase in deformation temperature. The PAGs are 16.7 μm in the temperature of 950 °C and up to 27.1 μm in the temperature of 1100 °C. The average austenite grain size was sharply decreased from 31.2 to 24.4 μm with the rise of strain rate from 0.2 to 2 s−1; the degree of decrease gets slow and becomes 21.9 μm at the strain rate of 5 s−1. Moreover, the constitutive equation of activation energy and grain sizes of dynamic recrystallization in the deformation process were established, and the dynamic recrystallization was elaborated in the deformation temperature of 950 to 1200 °C and strain rate ranging of 0.02 to 5 s−1. The dynamic recrystallization in the rolling process can be well reflected by the established models.
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