Micromechanisms of fatigue crack growth in a single crystal Inconel 718 nickel-based superalloy |
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| Affiliation: | 1. IMDEA Materials Institute, C/Eric Kandel 2, 28906 Getafe, Madrid, Spain;2. Department of Materials Science, Polytechnic University of Madrid/Universidad Politécnica de Madrid, E. T. S. de Ingenieros de Caminos, 28040 Madrid, Spain;1. University of Žilina, Dept. of Materials Engineering, Žilina, Slovakia;2. University of Parma, Dept. of Industrial Engineering, Parma, Italy;3. Institute of Physiscs of Materials, Brno, Czech Republic |
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| Abstract: | The fatigue crack growth behavior of an experimental, single crystal alloy, of equivalent nominal chemical composition to Inconel 718 is presented. Fracture modes under cyclic loading were determined by scanning electron microscopy. The results of the fractographic analyses are presented on a fracture mechanism map that shows the dependence of the fatigue fracture mechanisms on the maximum stress intensity factor, Kmax, and the stress intensity factor range, ΔK. Crack-tip deformation mechanisms associated with fatigue crack growth were studied using transmission electron microscopy. The relative effects of ΔK and Kmax on the fatigue crack growth behavior of this material are discussed within the context of a two-parameter crack growth law. The influence of grain boundaries on the fatigue crack growth resistance of materials such as Inconel 718 is also discussed in light of the results of this investigation. |
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