Hot Deformation-Softening Behavior of As-cast 0Cr23Ni13 Austenitic Stainless Steel

The hot deformation-softening behavior of as-cast ultra-low carbon 0Cr23Ni13 austenitic stainless steel was investigated using Gleeble-3500 at the temperature range of 850–1250 °C and at the strain rate of 0.01–10 s −1 . The results show that as the strain rate remains constant, the flow stress of 0Cr23Ni13 steel decreases with increase in deformation temperature. Dynamic recrystallization (DRX) is considerably influenced by strain rate, whereas austenite DRX is more sensitive to deformation temperature. At 1150 °C and 0.01 − 10 s −1 , the ferrite phase undergoes continuous dynamic recrystallization (CDRX) from low-angle grain boundaries (LAGBs) to high-angle grain boundaries (HAGBs). At 1150 °C and 0.01 s −1 , the austenite phase is dominated by discontinuous dynamic recrystallization (DDRX). The optimal hot deformation area is determined at temperatures ranging from 1100 to 1250 °C and strain rates ranging from 0.01 to 0.05 s −1 . The η can reach higher value of 0.37–0.44, which is the best window for hot deformation.