Fatigue properties are of special interest since the actual materials are used in highly stressed railway components. A good resistance towards fatigue would lead to a longer lifetime, longer periods between maintenance and not least, to an increased safety of the railway system. Extraordinary stresses due to impact loads are experienced in the switch blades and the crossing. Regarding the switch blade, the relatively thin tip of the blade is in the worst case pressed between the stock rail and the wheel flange. This can lead to deformation and by frequent recurrence to fatigue cracks which in turn can cause the break-out of pieces of the switch blade. In the worst case such defects in the switch blade can lead to that the wheel flange climbs up on the rail and the train derails. In the case of the crossing, the exceptional impact loads are mainly due to the short gap that the wheel has to pass. This study compares the monotonic and cyclic deformation behaviour of three alternative steels aimed for highly loaded railway components; the pearlitic UIC 900A (Fe-O.7C-1.0Mn), the austenitic Mn13 (Fe-13Mn-1.0C-0.5Si) and the martensitic 51CrV4 (Fe-0.51C-0.9Mn-1.1Cr-0.2V). Low cycle fatigue tests were carried out at three levels of constant total strain amplitude. The performance of the materials are compared as regards hardening softening during cyclic loading as well as lifetimes in strain and stress controlled fatigue tests.
Low cycle fatigue behaviour of alternative steels for highly stressed rail components
2008
6 Seiten, 6 Bilder, 3 Tabellen, 1 Quelle
Conference paper
English
Schiene (Eisenbahn) , perlitischer Stahl , austenitischer Stahl , martensitischer Stahl , Ermüdung bei niedrigen Lastspielzahlen , Niedriglastwechselversuch , Wechselfestigkeit , zyklische Belastung , Dauerschwingprüfung , Ermüdungsriss , Aushärten (Metall) , Entfestigung , Switch-Blade , Ermüdungsverhalten , Verformungsverhalten
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