Strain?Induced Martensite Formation and Mechanical Properties of Fe–19Cr–4Ni–3Mn–0.15N–0.15C Austenitic Stainless Steel at Cryogenic Temperature

Herein, considerable insight is provided into the evolution of strain-induced martensite and mechanical properties Fe–19Cr–4Ni–3Mn–0.15N–0.15C wt% austenitic stainless steel (in short Cr19NC15.15) during deformation at room temperature cryogenic temperatures. In situ magnetic measurements tensile tests various temperatures are conducted. The triggering stress ? trigg. ? ? ? ? required for formation determined minimum in strain hardening curve. It found that with reducing range from 0 to –20 °C slightly decreases, whereas increases further reduction ?70 °C. relation between formed ??-martensite fraction applied test established. results demonstrate a reduced (RT) significantly enhances transformation rate total volume ??-martensite. yield strength increase elongation continuously decreases due an increasing decreasing temperature. kinetic follows Olson Cohen's model good agreement experiment theoretical calculations.