Abstract
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A model for prediction of the dynamic recrystallization microstructure and properties evolution of hot
deformed austenite for micro alloyed steel by cellular automaton (CA) was developed. The theoretical
modeling of dynamic recrystallization was on the basis of dislocation density, and the nucleation and grain
growth of dynamic recrystallization were considered. The microstructure evolution of austenite dynamic
recrystallization, such as the grain shape, grain size and volume fraction, was predicted quantitatively and
visually described. Moreover the distribution and variation of the dislocation density and flow tress were
obtained. Meanwhile, the microstructure and variation of the flow tress of micro alloyed< steel during hot
deformation were measured by experiments. The measured results were in good agreement with the CA
calculation results.