In the present contribution, the cyclic deformation behaviour of the railway wheel steels SAE 1050 and SAE 1060 was investigated in the very high cycle fatigue (VHCF) regime using a resonance testing device at a frequency of 200 Hz. The specimens were machined from the area of the limiting-diameter of original monobloc-wheels. The wheels were provided by a system supplier of the Deutsche Bahn AG. The cyclic deformation behaviour is analysed by using highly precise methods for measuring the frequency, temperature and electrical resistance, which show deformation-induced changes of the microstructure within the bulk material during the fatigue process. The initial state of the material is investigated thoroughly by using light-, scanning- and transmission electron microscopy. The dislocation structure was investigated in defined fatigue states showing dislocation walls at 5% Nf and dislocation cells at 85% Nf. S-N (Woehler) curves are presented for both wheel steels. Fatigue failures at Nf > 107 were observed.
Cyclic deformation behaviour of railway wheel steels in the very high cycle fatigue (VHCF) regime
International Journal of Fatigue ; 33 , 1 ; 69-74
2011
6 Seiten, 9 Bilder, 1 Tabelle, 13 Quellen
Article (Journal)
English
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