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Gewählte Publikation:

Schonbauer, BM; Perlega, A; Karr, UP; Gandy, D; Stanzl-Tschegg, SE.
(2015): Pit-to-crack transition under cyclic loading in 12% Cr steam turbine blade steel
INT J FATIGUE. 2015; 76: 19-32. FullText FullText_BOKU

Fatigue measurements were performed up to the very high cycle fatigue regime in order to investigate pit-to-crack transition in 12% Cr steam turbine blade steel. Pre-pitted and smooth specimens were tested in air and aerated 6 ppm Cl- solution. S-N curves for different stress ratios were determined and a stress ratio dependent critical pit size for pit-to-crack transition with subsequent failure was found. Early crack initiation and small crack growth were observed in the process of development and by fractography using field emission scanning electron microscopy. Fatigue crack growth rates (FCGR) for cracks emanating from pits were determined. Good similarity of FCGR curves for short and long cracks was obtained by normalising the stress intensity factor ranges with the threshold values. (C) 2014 Elsevier Ltd. All rights reserved.
Autor*innen der BOKU Wien:
Karr Ulrike
Perlega Andrea
Schönbauer Bernd
Tschegg Stefanie

Find related publications in this database (Keywords)
Corrosion fatigue
Pitting corrosion
Very high cycle fatigue
Small fatigue crack growth
12% Cr stainless steel

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