Effect of Preliminary Cold Working on High-Temperature Tensile Behavior of Nickel-Free High-Nitrogen Austenitic Steel

Resumo

The effect of solution treatment and preliminary cold working on the high-temperature tensile behavior of a high-nitrogen nickel-free corrosion-resistant austenitic steel at 875 – 950°C and different deformation rates (from 10 ^{– 2} to 10 ^{– 4} sec ^{– 1} ) is studied. It is shown that the steel has high mechanical properties after the solution treatment. After the cold rolling the strength of the specimens increases and the ductility decreases due to strong strain hardening. At a high temperature, the stress-strain curves exhibit serrations at the lower deformation rates. The strength of such specimens is lower than after the solution treatment.