, Volume 5, Issue 4, pp 891-897

The low cycle fatigue of three wrought nickel-base alloys

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The low cycle fatigue behavior of three wrought nickel-base alloys, alloy 901, Waspaloy and alloy 718, has been examined at both room temperature and 811 K (1000°F). The fatigue properties can be rationalized in terms of the Manson-Coffin equation relating total strain range with the number of cycles to failure. For a given total strain range the fatigue life of the alloys at 811 K (1000°F) is substantially less than at room temperature. Microstructural examination revealed that crack nucleation and initial propagation was of classical stage I type. The cracks develop at the surface of test specimens and propagate along slip planes. Evidence is presented to relate the observed fatigue softening with shear and dissolution of γ precipitates.