摘要：Hot torsion tests were performed to fracture on type 317 stainless steel in both the as-cast and the worked condition, at temperatures between 900 and 1200°C and strain rates of 0.1-5 s -1 in order to study the microstructure responsible for hot workability behaviour. Each flow curve exhibited a peak followed by a decrease to a steady-state regime as a result of dynamic recovery and dynamic recrystallization. The hypothetical saturation stress due to dynamic recovery and the critical stress for dynamic recrystallization were determined from the strain hardening rate vs stress plots. The dependence of flow stress on temperature followed an Arrhenius function with an activation energy of 508 kJ/mol for the as-cast and 496 kJ/mol for the worked material. The role of 5 ferrite particles on dynamic restoration and on mechanical behaviour was analyzed. The subgrain and recrystallized grain sizes were related to the conditions of deformation.
