Flow behavior modeling and processing maps for P91 steel during hot deformation

摘要

Constitutive analysis and processing maps have been performed from hot compression tests on P91 steel over a range of temperatures between 950 °C to 1200 °C and strain rates of 0.05 to 1 ssup-1/sup. Hyperbolic sine type of constitutive equation has been established. The activation energy Q is 441.864sup?/supksup?/supJsup?/supmolsup?1/sup, larger than the austenite lattice self-diffusion activation energy. The processing maps have been developed based on the dynamic materials model (DMM) and Prasad’s instability criterion. The optimum hot deformation regions at 0.7 strain have at the temperature of 1000-1175 °C and strain rate of 0.05-0.14 ssup?1/sup; at the temperature of 1100-1200 °C and strain rate of 0.14-1ssup?1/sup.