Hot deformation behavior and processing map of an ODS-310 alloy

Hot deformation behavior of ODS-310 alloy was investigated by conducting hot compression deformation tests on Gleeble-1500D simulator at the temperatures range of 1 050 ~1 150 ℃ and the strain rate range of 0.001~1 s-1. True stress-true strain curves were obtained. The effects of strain rate and deformation temperature on flow stress were analyzed. The constitutive equation of the ODS-310 alloy at high temperatures was obtained by introducing Zener-Hollomom parameter. The processing map of ODS-310 was proposed on basis of dynamic materials model. The results show that the flow stress increases with the decrease of the deformation temperature and the increase of the strain rate. The flow behavior of ODS-310 alloy can be described by the hyperbolic sine model and the activation energy is about 828.384 kJ/mol. The processing map established at the true strain of 0.4 shows that there are two flow instability zones, including the zone at temperatures range of 1 050~1 070 ℃ and strain rate range of 0.01~1s-1,and the other zone at temperatures range of 1 130~1 150 ℃ and strain rate range of 0.1~1 s-1. The optimal processing parameters are the temperature of 1 150 ℃ and strain rate of 0.001 s-1.