Abstract：In order to study dynamic recrystallization behavior of Cr8 alloy，the hot compression tests of Cr8 alloy was carried out on the Gleeble-1500D thermal simulation test machine. Based on the data of experiment，the modified Laasraoui-Jonas（L-J） dislocation density model of Cr8 alloy was established. Combined with dynamic recrystallization nucleation and growth model，the dynamic recrystallization behavior of Cr8 alloy was simulated by the cellular automata（CA） module of Deform-3D finite element software，and the simulation dynamic recrystallization microstructure was compared with experimental microstructure. The results show that the deformation resistance-strain curves of Cr8 alloy show the typical characteristics of dynamic recrystallization at deformation temperature ranging from 900 to 1 200 ℃. The hot deformation activation energy of Cr8 alloy is 340.332 kJ/mol. Under the same strain rate，the dynamic recrystallization grain size of the Cr8 alloy increases when the deformation temperature increases. The simulation results of recrystallized grain size agree well with experiments. The average relative error is within 7%，which prove the established L-J dislocation density model can accurately predict the microstructure evolution during dynamic recrystallization of the Cr8 alloy.
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2018, Vol. 53 
