A modified Johnson-Cook model for 10%Cr steel at elevated temperatures and a wide range of strain rates

A modified J-C model of 10%Cr steel, based on the original J-C model, is further developed to consider not only the coupling effects of strains, strain rates and temperatures, but also the mechanism of the hardening and the flow softening during whole deformation processes. The model can simulate multi-deformation processes including work hardening, recovery and recrystallization at the high temperature for use as the nuclear power equipments. To establish this new model, the compression tests at different temperatures (950-1250 degrees C) and strain rates (0.001 s(-1) - 0.01 s(-1)) were conducted and the observations of microstructure under various conditions were performed. The results indicate that the influences of the strain, strain rate and temperature on the strain hardening of material are not independent of each other, while many of them interact. Moreover, Compared with the original J-C model and experimental data, the modified J-C model has good predictability of the hot deformation behavior of material.