Pit-to-crack transition under cyclic loading in 12% Cr steam turbine blade steel

•The minimum pit size leading to fatigue failure is dependent on R-ratio.•Fatigue cracks initiate at the mouths of deep corrosion.•A two-step model is developed to calculate ΔK for cracks emanating from pits.•Similarity for small and long cracks is obtained in da/dN vs. ΔK/ΔKth diagrams.•A formerly...

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Veröffentlicht in:	International journal of fatigue 2015-07, Vol.76, p.19-32
Hauptverfasser:	Schönbauer, Bernd M., Perlega, Andrea, Karr, Ulrike P., Gandy, David, Stanzl-Tschegg, Stefanie E.
Format:	Artikel
Sprache:	eng
Schlagworte:	12% Cr stainless steel Blades Chromium Corrosion fatigue Fatigue (materials) Fatigue failure Fracture mechanics Martensitic stainless steels Pitting corrosion Small fatigue crack growth Steam turbines Stress ratio Very high cycle fatigue
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