An investigation of the micromechanisms of fatigue crack growth in structural gas turbine engine alloys |
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| Authors: | C. Mercer S. Shademan W. O. Soboyejo |
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| Affiliation: | (1) Department of Mechanical and Aerospace Engineering, and the Princeton Materials Institute, Princeton University, Princeton, NJ 08544, USA;(2) Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210, USA |
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| Abstract: | This paper presents an overview of fatigue fracture modes in selected structural alloys employed in gas turbine engines. These include the mechanisms of fatigue crack growth in the near-threshold, Paris and high- K regimes obtained from Ti-6Al-4V, Inconel 718 and PWA 1472 (a single crystal nickel-based superalloy of similar chemical composition to Inconel 718). Fatigue fracture modes in these materials are shown to be strong functions of the stress intensity factor range, K, and the maximum stress intensity factor, Kmax. Fatigue mechanism maps are also presented to show the parametric ranges of K and Kmax corresponding to the different fatigue fracture modes. |
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