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Cast Ni-based superalloys, essential materials for gas turbines, possess large grains comparable to wall thickness of structural components: e.g., blades and vanes. Fatigue cracks propagating in these kinds of materials must be significantly influenced by crystallographic factors of materials: e.g. orientation of grains and grain boundaries. This paper covers such a basic problem. For the purpose, at first an effect of crystallographic orientation on the crack propagation rate is introduced, using a single crystal Ni-based superalloy CMSX-4 specimen with different primary and secondary orientations. Discussions are also made on what mechanics and mechanisms control the fatigue crack propagation behavior, on the basis of anisotropic fracture mechanics

Subcritical Crack Growth on Crystallographic Planes in a Ni-base Superalloy: Relevance to Orientations