ABSTRACT
Single crystal Ni-base superalloys are selected as the subject of this special chapter because their important applications as gas turbine blades and their peculiar deformation and fracture behaviors as anisotropic materials. First of all, the anisotropic creep behavior of CMSX-4 is described using ICFT in Hill’s anisotropic form. Second, fatigue of single crystal Ni-base superalloy is described using the anisotropic formulation based on dislocation pile-ups on certain favorable slip planes (see Chapter 9). The orientation dependence of fatigue crack growth is also discussed, likewise. Following the same approach as for isotropic materials as described in the earlier chapters, a complete ICFT formulation for single crystal NI-base superalloys can be developed including anisotropic plasticity and creep with Hill’s theory, but more work is left to the interested readers.
