Hot tensile deformation and fracture behavior of a nitrogen alloyed ultralow carbon austenitic stainless steel

Abstract

The hot tensile deformation and fracture behavior of a nitrogen alloyed ultralow carbon austenitic stainless steel were studied by a Gleeble- 1500D thermo-mechanical simulator with the temperature range of 11731473K and strain rate range of 0.011 s1. Microstructural evolution was analyzed in terms of fractography at various deformation temperatures and strain rates. The tensile true stress-True strain curves after necking were calculated by the heuristic method. The fracture threshold values of the studied steel were estimated by finite element method (FEM). The final load-stroke curves obtained from the FEM simulation were found to have a good agreement with the experimental load-stroke curves. The quantitative relationship between fracture threshold value and Zener-Hollomom parameter was also established. The results are beneficial to the understanding of hot deformation behavior of a wide range of stainless steels.