The effects of crystal orientation ( ) on the structural strength of single crystal turbine vanes and blades calculated with the finite element method (FEM) is discussed in this paper. TMS-75, a 3^<rd> generation single-crystal Ni-base superalloy, is chosen as the model material for turbine vanes and blades. It became clear that, (1) The strength of the turbine vane on the crystal orientation was depended on coordinate plane: there are lower Mises stress in XY plane and maximum Mises stress in near the =45° at both YZ and ZX Planes. (2) In the case of a blade, the influence is similar to vane on blade tip, but the converse holds for the blade root.
