Abstract
The high temperature deformation behavior of 05Cr17Ni4Cu4Nb stainless steel was investigated at the temperatures from 1000 to 1200°C and strain rates from 0.01 to 10s-1 on Gleeble-3500 thermo-simulation machine. The stress-strain curves at lower strain rate (0.01-0.5 s-1) exhibit a single peak stress, indicating a typical dynamic recrystallization (DRX) behavior of the steel, but at higher strain rates (10 s-1), the temperature rise due to the heat liberated from severe plastic deformation leads to the final drop of flow stress. Further microstructural observation confirmed the occurrence of DRX behavior, the average grain sizes decreased with the increasing strain rate and the decreasing deformation temperature, and the higher the deformation temperature, the larger the DRX degree. A new constitutive equation incorporating the effect of the strain on the deformation behavior was proposed based on the Arrhenius-type equation, in which the material constants α, n, Q and A were found to be polynomial functions of strain. The stress-strain relations of 05Cr17Ni4Cu4Nb steel predicted by the proposed constitutive equation agreed well with experimental results.
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