Analysis of fatigue crack initiation in cycled austempered ductile cast irons

0355182 - ÚFM 2011 RIV NL eng J - Journal Article
Petrenec, Martin - Beran, Přemysl - Dluhoš, J. - Zouhar, Michal - Ševčík, Martin
Analysis of fatigue crack initiation in cycled austempered ductile cast irons.
Procedia Engineering. Roč. 2, č. 1 (2010), s. 2337-2346. E-ISSN 1877-7058.
[Fatigue 2010. Praha, 06.06.2010-11.06.2010]
R&D Projects: GA ČR GAP108/10/2371; GA ČR GD106/09/H035
Institutional research plan: CEZ:AV0Z20410507; CEZ:AV0Z10480505
Keywords : Low cycle fatigue * ADI * Finite element modelling * Neutron diffraction
Subject RIV: JL - Materials Fatigue, Friction Mechanics

Interrupted total strain controlled tests have been performed on cylindrical specimens of austempered ductile cast iron (ADI) with the aim to study fatigue crack initiation and provide the fine numerical simulations at temperatures 23 °C and–45 °C. The systematic observation of the same places on surface specimen by SEM was done in interrupted low cycle fatigue test. Fatigue cracks initiated preferably from persistent slip markings at the interface of graphite nodule and the ausferrite matrix and places without visible graphite nodule. To prove this assumption the numerical simulations were performed in order to study this situation in more details. The numerical analyses presented here helped to better understanding of the experimentally observed processes in the fatigued ADI.
Permanent Link: http://hdl.handle.net/11104/0194012