Abstract
Important components of gas turbine engines such as blades and turbine rotors made of creep-resisting nickel alloys, operate in a wide range of temperatures and loading frequencies. In conditions of high temperature, the frequency and temperature are the factors affecting the variation of the fatigue resistance characteristics of the creep-resisting nickel alloys. For this reason, the authors determine the relationships governing the effect of the cyclic loading frequency on the fatigue resistance in a wide temperature range, in order to use the multicycle fatigue characteristics usually obtained at loading frequencies of 25-50 Hz. The investigations were selected on nickel-based creep-resisting alloys: deformable EI867, EP109 alloys, and cast ZhS6k, ZhS6U, and VZhL12U alloys. Various relationships governing the effect of loading frequency on the fatigue resistance of EI867 alloy in the temperature ranges below and above 0.55-0.6 T/sub m/ were determined. It was shown that in the temperature ranges above 0.55-0.6 T/sub m/, the results of the fatigue tests carried out at various temperatures and loading frequencies can be described on the basis of the kinetic model with the piecewise-exponential dependences of the number of cycles to fracture on loading frequency at the field levels of alternating stress.
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