About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
M-21: Fatigue Crack Initiation and Growth Behaviour Within Various Notch Geometries in the Low-cycle Fatigue Regime of FV566 In-service Steam Turbine Blade Material |
Author(s) |
Benjamin MD Cunningham, Philippa Reed, Ara Khodavirdi |
On-Site Speaker (Planned) |
Ara Khodavirdi |
Abstract Scope |
Plain bend bars made from FV566 martensitic stainless steel were extracted from the root of ex-service power plant turbine blades and several industry relevant notches introduced. Some of the samples were shot peened. The notched bend bars were loaded plastically in the low cycle fatigue regime and FE modelling carried out to investigate the effects of changing notch geometry combined with shot peening on fatigue behaviours such as crack initiation, short crack growth and coalescence. Shot peening damaged the notch surface accelerating initiation behaviours but had a lifetime extending effect by retarding short crack growth in all tested notch geometries. At total strain range higher than 1.2%, the lifetime extension benefit from shot peening was diminished due to compressive residual stress relaxation in the notch stress field. Notch geometry was found to have no notable difference on fatigue life when tested at identical strain ranges. |
Proceedings Inclusion? |
Planned: |
Keywords |
Iron and Steel, Modeling and Simulation, Other |