Abstract: Hot compression deformation experiment of pure nickle and GH3625 alloy were conducted on a Gleeble-3500 thermomechanical simulator at a 900 to 1 200 ℃, a deformation rate range of 0.1~10 s^－1 and a deformation of 60%. The constitutive equation of pure nickel and GH3625 alloy were constructed. The processing map which under different deformation parameters were drawn and the microstructure characteristics of the stable and unstable regions of the processing map were analyzed. During the hot compression deformation of pure nickel, it was found that the grain appears to hierarchical differentiation. According to the analysis of the process map, the optimum hot deformation temperature of pure nickel is1 050 ℃, the strain rate is 0.1 s^－1, the optimum deformation temperature of Inconel alloy is about 1 170 ℃, the strain rate is 0.1 s^－1.

Key words: pure nickel, GH3625 alloy, constitutive equation, processing map, rheological behavior