Mechanisches und chemisches Verhalten von Lean-Duplex-Stählen nach Wärmebehandlungen in kritischen Temperaturbereichen

Lean-duplex steels represent a low-cost option compared to austenitic and standard-duplex steels. This is achieved by reducing the content of nickel and molybdenum through substitution with manganese and nitrogen, respectively. These elements also improve the mechanical properties. In this work, two lean-duplex steels X2CrMn- NiN22–5-2 (LDX 2101) and X2CrNiN23–4 (SAF 2304) are compared with respect to their mechanical und chemical behaviour after different annealing conditions at 475 °C and 700 °C. All visible differences are the consequence of phase separation (α'-phase), precipitations (σ-phase, carbides and nitrides) as well as the formation of secondary austenite.