Investigation on Hot Compression Precipitation and Recrystallization Behavior of 23.7Cr–2.2Ni–1.3Mo–14Mn–0.26N High‐Manganese Low‐Nickel Duplex Stainless Steel

Isothermal compression deformation studies for 23.7Cr–2.2Ni–1.3Mo–14Mn–0.26 N low‐nickel duplex stainless steel (DSS) are investigated under deformation conditions of 800–1150 °C/0.01–10 s −1 . The flow curve and deformation microstructure analysis show that deformation softening changes from ferrite dynamic recrystallization (DRX) to austenite DRX, with increasing temperature from 800 and 900 °C to 1050 °C deformed at 0.01–1 s −1 . The sigma ( σ ) precipitate formation is mainly affected by the interaction of deformation temperature and strain rate. In addition to deformation time controlled by strain rate, the refining microstructure of ferrite DRX accelerates σ precipitate formation due to the increase in diffusion channels deformed at 900 °C/0.01 s −1 and 900 °C/1 s −1 . The hot deformation activation energy is calculated as 367.03 kJ mol −1 , and the relationship between the critical conditions for DRX initiating and Zener–Hollomon parameters is established. The decreasing Z value contributes to deformation softening at low strain, and the DRX softening effect is enhanced deformed at 800–900 °C/0.01–0.1 s −1 . Meanwhile, the modified dynamic crystallization kinetics model of tested DSS at a strain rate of 1 s −1 is established.