Flow stress modeling, processing maps and microstructure evolution of 05Cr17Ni4Cu4Nb Martensitic stainless steel during hot plastic deformation

Abstract

The hot deformation behavior of 05Cr17Ni4Cu4Nb stainless steel at the temperatures from 950 C to 1250 C and strain rates from 0.01 s-1 to 5 s-1 was investigated on the basis of test data obtained by Gleeble1500D thermo-simulation machine. A two-stage flow stress constitutive model incorporating the effects of the strain rate and temperature on the deformation behavior is proposed. The stress-strain relations of 05Cr17Ni4Cu4Nb steel predicted by the proposed model agree well with the experimental results. Moreover, the hot processing maps are also investigated. Combined with the microstructure evolution analysis, the appropriate hot forming processing parameters of 05Cr17Ni4Cu4Nb steel is proposed in the temperature range of 1000-1100 C and strain rate range of 0.01-0.02 s-1