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Failure behaviour of the superalloy MAR-M247 LC under LCF, HCF and combined LCF/HCF loading

  • Domnin Gelmedin and Karl-Heinz Lang

Abstract

Materials for turbine blades experience in service a combined loading of low and high cycle fatigue at high temperatures. In order to understand the failure behaviour under these loading conditions, systematic investigations were carried out. Low cycle fatigue, high cycle fatigue and combined low and high cycle fatigue tests were realised on MAR-M247 LC at 650 °C in an air environment under total strain control. Surface damage and fracture surfaces were analysed. Under combined low and high cycle fatigue, the lifetime is reduced if the low cycle fatigue leads to a degradation of the high cycle fatigue strength caused by crack initiation and crack growth. By analysing the fracture surface, the crack growth rate under combined cycle fatigue loading could be determined and it was significantly higher than under pure low cycle fatigue loading. The accelerated crack growth mainly causes the lifetime reduction.


* Dipl.-Ing. Domnin Gelmedin, Karlsruher Institut für Technologie (KIT), Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Campus Süd, Engelbert-Arnold-Straße 4, D-76131 Karlsruhe, Germany. Tel.: +49 721 608-46595, Fax: +49 721 608-48044, E-mail:

Dedicated to Prof. Dr.-Ing. Christina Berger on the occasion of her 65th birthday


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Received: 2011-9-8
Accepted: 2011-10-19
Published Online: 2013-06-11
Published in Print: 2012-01-01

© 2012, Carl Hanser Verlag, München

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