Fatigue crack propagation in nickel-base superalloys – effects of microstructure, load ratio, and temperature

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Abstract
The current state of knowledge and understanding of the long fatigue crack propagation behaviour of nickel-base superalloys are reviewed, with particular emphasis on turbine disc materials. The data are presented in the form of crack growth rate da/dN versus stress intensity factor range δK curves, and the effects of such variables as microstructure, load ratio R, and temperature in the near-threshold and Paris regimes of the curves, are discussed. MST/521