The evolution of plasticity for nickel-base single crystal cooled blade with film cooling holes

In order to get the information of the stress structure and the activated slip system of nickel-base single crystal cooled turbine blades, the uniaxial tensile specimens with single hole were studied by means of the crystal plasticity finite element method and experimental observations. The results of experiment suggest that cracks developed and formed fracture surfaces along the deformation bands. The computational results show that the activated slip systems along the thickness direction and at free surface are significantly different. The stress fields on the surface form four banded stripes around the hole, on which the initiation and propagation of the cracks are dependent. The experimental observed slip traces are found to be in a good agreement with the predicted slip sector based on the FEM.