Strain dependent rate equation to predict elevated temperature flow behavior of modified 9Cr-1Mo (P91) steel

▶ Constitutive analysis is performed on hot compression flow data for P91 steel. ▶ The data is examined in terms of modulus, lattice and pipe diffusion coefficients. ▶ P91 steel obeyed rate equation ε˙/DL = constant [sinh(αLσ/G)]nh ; αL, Ah, nh were strain dependent. ▶ Deviation in prediction was observed at lower strain rates 0.001 and 0.01 s−1. ▶ R = 0.99 and AARE = 7.3% revealed satisfactory prediction for the entire domain.