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First attempts towards the early detection of fatigued substructures using cyclic-loaded 20 MnMoNi 5 5 steel

: Seibold, A.; Dobmann, G.

Nuclear Engineering and Design 137 (1992), pp.363-369
ISSN: 0029-5493
Journal Article
Fraunhofer IZFP ()
Ermüdung; fatigue; LCF-Ermüdung; Lebensdauervorhersage; lifetime prediction; low cycle fatigue; micromagnetic inspection; microstructure; mikromagnetische Prüfung; Mikrostruktur; nondestructive testing; TEM; Zerstörungsfreie Prüfung

Materials subjected to cyclic loading undergo substructural changes which may affect service life. The low alloy, fine grained structural steel 20 MnMoNi 5 5 is used to demonstrate how suvstructural changes detected using TEM tehcniques are a function of the numver of cycles undergone. For a given cyclic loading the usage factor n= N/Nf= 0.5 can be derived. Initial investigations using nondestructive examination methods have indicated that substructural changes and magnetic variables can be correlated.