Constitutive modeling of hot deformation behavior of X20Cr13 martensitic stainless steel with strain effect
(Institute of Plasticity Technology, Shanghai Jiao Tong University, Shanghai 200030, China)
Abstract: Hot deformation behavior of X20Cr13 martensitic stainless steel was investigated by conducting hot compression tests on Gleeble-1500D thermo-mechanical simulator at the temperature ranging from 1173 to 1423 K and the strain rate ranging from 0.001 to 10 s-1. The material constants of α and n, activation energy Q and A were calculated as a function of strain by a fifth-order polynomial fit. Constitutive models incorporating deformation temperature, strain rate and strain were developed to model the hot deformation behavior of X20Cr13 martensitic stainless steel based on the Arrhenius equation. The predictable efficiency of the developed constitutive models of X20Cr13 martensitic stainless steel was analyzed by correlation coefficient and average absolute relative error which are 0.996 and 3.22%, respectively.
Key words: martensitic stainless steel; hot deformation behavior; flow stress; constitutive modeling