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Hot deformation behaviour and processing map of a typical Fe-Mn-Si-Cr steel for automotive body structures

ABSTRACT The hot deformation behaviour and processing maps of a typical Fe-Mn-Si-Cr steel for automotive body structures were investigated on a Gleeble3500 simulation tester by isothermal compression test in the temperature ranging of 950°C to 1150°C and a strain rate of 0.05–10 s−1. The results show that dynamic recrystallisation softening mechanism is more evident at low strain rate, while dynamic recovery is more evident at high strain rate. The instability parameter ξ() values are negative and considered as unsafe deformation zones at low deformation temperature and high strain rates. The processing maps exhibit two safe domains for hot working: (a) 0.05–1 s−1 and 1080–1150°C, the power dissipation values of η increase with the increase of strain rate. (b) 0.05–1 s−1 and 950–1020°C, while strain is lower than 0.1, the values of η decrease with the increase of strain rate.