About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
Slip Localization, Slip Transfer at Grain Boundaries and Crack Initiation during Fatigue of Solution-hardened Ni-based Superalloys |
Author(s) |
Ignacio Escobar-Moreno, Javier Llorca |
On-Site Speaker (Planned) |
Javier Llorca |
Abstract Scope |
Ni-based superalloys are widely used in rotating elements in aircraft engines and their performance is often limited by the nucleation of fatigue cracks. In this investigation, the deformation mechanisms under fully-reversed, strain controlled cyclic deformation were analyzed in two different solution-hardened Ni-based superalloys, Inconel 600 and Hastelloy C276. The grain size and volume fraction of annealing twins was modified by means of heat treatments. The active slip systems were ascertained by means of slip trace analysis in the scanning electron microscope in combination with electron back-scatter diffraction during interrupted fatigue tests at different cyclic strain amplitudes in the low-cycle fatigue regime. In addition, the conditions for slip transfer/blocking at regular grain and twin boundaries were determined as well as the preferent locations for crack nucleation. It was found that damage nucleation often occurred at regular grain boundaries and triple junctions. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, |