Fatigue and strength of new grey iron alloys for break discs
2013 (English)In: Seventh International Conference on Low Cycle Fatigue / [ed] T. Beck, E. Charkaluk, Berlin: Deutscher Verband für Materialforschung und -Prüfung E.V. , 2013, 45-50 p.Conference paper (Refereed)
The static and low cycle fatigue properties of four pearlitic grey iron alloys intended for brake discs are investigated. The effect of alloying a base composition with 0.1 wt% and 0.3 wt% niobium is compared to a 0.3 wt% addition of the more conventional alloying element molybdenum. The results show that the static properties remain unaffected for an Nb content of 0.1 wt% while an addition of 0.3 wt% Nb or 0.3 wt% Mo increases the strength compared to the base alloy without Nb and Mo. The fatigue life on the other hand remains more or less unaffected by the alloying, although the stress levels are substantially higher for the compositions with 0.3 wt% Mo or 0.3 wt% Nb. Thus, the experiments show that graphite is very important for the low cycle fatigue life. It is also seen that crack propagation controls more than 90% of the life. Full scale brake dynamometer crack tests also gave a similar fatigue life of the different brake disc alloys independent of the composition.
Place, publisher, year, edition, pages
Berlin: Deutscher Verband für Materialforschung und -Prüfung E.V. , 2013. 45-50 p.
Brake discs, Grey iron, Mechanical properties, TMF, LCF
Metallurgy and Metallic Materials Applied Mechanics
IdentifiersURN: urn:nbn:se:liu:diva-98297ISBN: 978-3-9814516-2-7OAI: oai:DiVA.org:liu-98297DiVA: diva2:654579
Seventh International Conference on Low Cycle Fatigue, September 9-11, 2013, Aachen, Germany