Deformation and Fracture of 13CrMoNbV Ferritic-Martensitic Steel at Elevated Temperature

Based on the results of compression tests in temperature ranges of 1100–1250°С and strain rates of 0.1–10 s –1 , a rheological model of the deformation behavior of the 13CrMoNbV ferritic-martensitic steel is constructed. A fracture criterion for the 13CrMoNbV steel in the process of hot plastic deformation and a method for determining its critical value, based on tensile tests at a Gleeble 3800 complex for physical modeling of thermomechanical processes and the results of modeling using the finite element method,—are proposed. The rheological model and the fracture criterion showed satisfactory accuracy when calculating the deformation process under conditions of a complex stress–strain tension–torsion state at the Gleeble 3800 complex at a temperature of 1100°C.