The hot working mechanism of 2Cr11Mo1VNbN steel was investigated by means of compression tests at temperatures of 900−1150 °C and strain rates of 0.005−5 s−1. At strains of 0.2, 0.3, 0.5 and 0.7, the relationship among strain rate sensitivity, power dissipation efficiency and instability parameter under different conditions were studied. Power dissipation maps and instability maps at different strains were established. The optimal and the instable deformation regimes were established by the processing maps based on the dynamic material model. The processing maps were developed for the typical strains of 0.2, 0.3, 0.5 and 0.7, predicting the instability regions occurring at high strain rate more than 0.05 s−1, which should be avoided during hot deformation. The optimized processing parameters for hot working of 2Cr11Mo1VNbN supercritical stainless steel were temperatures of 1080− 1120 °C and strain rates of 0.005−0.01 s−1.
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