Flow stress behavior of two stainless steels: An experimental–numerical investigation

This paper considers re-assessment of the material behavior of stainless steels 1.4021 and 1.4841 using the compression test at medium strain and high temperature (1100 °C), for forming simulation, and compares the result of the forging test with the finite element simulation predictions using the derived constitutive equations; thus making a link between the numerical simulation and the experimental results that can justify both the modeling hypotheses of the simulation, and the assumptions used for measurements in the experimental test. Tests are carried out using a dilatometer for different strain rates. To decrease the role of friction, both the geometry of specimens and the lubricant used should be optimized. Norton–Hoff, logarithmic, Perzyna and Peirce constitutive equations are examined to find out the best coverage of the flow stress curves. The validity of the suggested constitutive equation is reconfirmed by comparing the geometrical deformation of the specimens and numerical simulation of the compression test.