Category: Peening

Environmental, Fatigue, Nickel, Peening, Superalloys

Factors affecting the corrosion fatigue life in nickel based superalloys for disc applications

The nickel based superalloy 720Li is employed in the gas turbine due to its mechanical performance at elevated temperature. A comprehensive assessment of the materials behaviour under representative service conditions is reported to address the drive for ever increasing temperatures and more arduous environmental exposure. Fatigue experiments have been performed in an air and air/SOx environment at 700 ∘C containing a mixed salt as a contaminant. … Continue reading Factors affecting the corrosion fatigue life in nickel based superalloys for disc applications

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Fatigue, Nickel, Peening, Superalloys

Influence of shot peening on high-temperaturecorrosion and corrosion-fatigue of nickel basedsuperalloy 720Li

High-temperature corrosion fatigue, a combination of corrosion with a fatigue cycle, is an emerging generic issue affecting power generation and aero gas turbine engines and has the potential to limit component life. Historically, surface treatments, such as shot peening have been used to improve component life and have been optimised for fatigue response. Research into optimisation of shot peening techniques for hot corrosion and high-temperature … Continue reading Influence of shot peening on high-temperaturecorrosion and corrosion-fatigue of nickel basedsuperalloy 720Li

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Fatigue, Nickel, Peening, Superalloys

Surface topography and the impact on fatigue performance

Areal characterization was applied to plain fatigue specimens manufactured from a nickel-based superalloy, Alloy 720Li, to determine the impact of machined/finished surface topography on fatigue performance of this material. Samples were subjected to fatigue testing in the as-turned and shot peened conditions to study the interaction between residual stresses and topography in influencing the fatigue performance. The turning process was deliberately manipulated to produce three … Continue reading Surface topography and the impact on fatigue performance

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Fatigue, Peening

Fatigue behaviour of geometric features subjected to laser shock peening: Experiments and modelling

Finite element models, using the eigenstrain approach, are described that predict the residual stress fields associated with laser shock peening (LSP) applied to aerospace grade aluminium alloys. The model was used to explain the results of laboratory fatigue experiments, containing different LSP patch geometries, supplementary stress raising features and different specimen thickness. It is shown that interactions between the LSP process and geometric features are … Continue reading Fatigue behaviour of geometric features subjected to laser shock peening: Experiments and modelling

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