Modeling of anisotropic tensile and cyclic viscoplastic behavior of a nickel-base directionally solidified superalloy

Effects of temperature and crystallographic orientation on tensile and cyclic viscoplastic behavior of a nickel-base directionally solidified superalloy, DZ125, have been experimentally investigated and modeled using a unified anisotropic viscoplastic constitutive model. This constitutive model is compiled as an ABAQUS/UMAT by the self-adaptive explicit integration scheme. A grouping optimization method is proposed to identify the material parameters. The results show that the unified viscoplastic constitutive model is able to characterize the rate-dependent anisotropic tensile and cyclic viscoplastic behavior of DZ125 superalloy and the simulation results are in good agreement with the experimental data.