Effects of hot deformation behavior and processing map on 316LN-Mn austenitic stainless steel dynamic recrystallization

The hot deformation behaviors of 316LN-Mn austenitic stainless steel (ASS) are investigated under uniaxial isothermal compression tests at different temperatures and strain rates. Additionally, the microstructural evolutions are investigated using electron backscatter diffraction (EBSD). The flow

stress decreased with increasing temperature and decreasing strain rate. A constitutive equation is established to characterize the relationship among the deformation parameters, and the deformation activation energy is calculated to be 497.92 kJ/mol. The processing maps are constructed to describe the

appropriate processing window, and the optimum processing parameters are determined at the temperature of 1107-1160 °C and the strain rate of 0.005-0.026 s ^-1 . The experimental results show that the main nucleation mechanism is discontinuous dynamic recrystallization (DDRX), and continuous dynamic recrystallization (CDRX) plays the secondary place. The formation of twin boundaries also facilitates the nucleation of dynamic recrystallization (DRX).