Hot deformation behavior of a new austenite–ferrite duplex stainless steel containing high content of nitrogen

The hot deformation behavior of a cost-saving duplex stainless steel (DSS) of 22Cr–1Ni–0.7Mo with N content of 0.36 ms% was studied over the range of temperatures from 1000 to 1200 °C and strain rates from 0.01 to 10 s−1 by hot compression tests. The processing map was established to integrate the relationship between hot workability and microstructural evolution. Both domains for temperatures from 1000 to 1050 °C and strain rate of 0.01 s−1 and temperatures from 1150 to 1200 °C and strain rate of 0.01 s−1 were found to be the optimum hot working regimes, in which the microstructure exhibited dynamic recrystallization (DRX). The unstable hot working domains were clearly indicated by the processing map. Wedge cracking, macro-cracking and dynamic strain ageing (DSA) had occurred during hot deformation under these hot working conditions, in good agreement with the predictions by the processing map.