Toward Unraveling the High Temperature Microstructure Processing Properties Relationship in a Ni‐Free High Nitrogen Bearing Duplex Stainless Steel

The present study deals with thermomechanical processing behavior of a Ni‐free high nitrogen bearing duplex stainless steel. This is performed through compressing the material over a wide range of temperature (700–1000 °C) under the strain rates of 0.001–0.1 s−1. The microstructural observations show that continuous and discontinuous dynamic recrystallization are taken place simultaneously in austenite at 900 and 1000 °C by generating subgrains and bulging along the prior austenite grain boundaries, respectively. Electron backscattered diffraction analysis also reveals that the occurrence of continuous dynamic recrystallization is the governing restoration phenomenon in ferrite over the studied conditions. At last, to consolidate the experimental results, a strain‐compensated constitutive model is developed to predict the flow behavior of N‐bearing duplex steel. The present study deals with thermomechanical processing behavior of a Ni‐free high nitrogen bearing duplex stainless steel. This was performed through compressing the material over a wide range of temperature and strain rates. The microstructural observations showed that continuous and discontinuous dynamic recrystallization were taken place simultaneously in austenite and continuous dynamic recrystallization was the governing restoration phenomenon in ferrite. At last, a strain‐compensated constitutive model was developed to predict the flow behavior of N‐bearing duplex steel.