Hot deformation behavior and processing map of a nickel-base superailoy GH4169

摘要

The hot deformation behaviors of the nickel-base superailoy GH4169 have been studied by isothermal constant true strain rate compression testing at 950°C-1150°C, 0.01s~(-1)-10s~(-1) and the height reduction 50%. The processing maps of GH4169 alloy have been constructed at different strains on the basis of testing data using a dynamic materials modeling. The maps exhibited two domains: the first at 950°C -1100°C and strain rate higher than 0.1s~(-1), with a peak efficiency of power dissipation of 0.1, and the second at 950°C-1100°C and strain rate lower than 1s~(-1), with a peak efficiency of power dissipation of 0.4 and the strain rate of 0.01s~(-1). On the basis of microstructure observations, the first exhibits adiabatic shear bands, which called instability domain, the second represents fine recrystallized grain structures, which called stability domain. The optimal hot-working parameters are at 1050°C, 0.01s~(-1).