Microstructural characterisation and constitutive behaviour of alloy RR1000 under fatigue and creep–fatigue loading conditions

C. Stocker, M. Zimmermann, H. Christ, Z. Zhan, Christophe Cornet, Liguo Zhao, M. Hardy, Jie Tong

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Mechanical behaviour of a nickel-based superalloy, RR1000, has been investigated at 650 °C under cyclic and dwell loading conditions. The microstructural characteristics of the alloy have been studied using scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the distribution patterns of the dislocations and slip planes have been compared between samples tested under fatigue and creep–fatigue loading conditions. Constitutive behaviour of the alloy was described by a unified constitutive model, where both cyclic plastic and viscoplastic strains were represented by one inelastic strain. The results show that the precipitation state is very stable at 650 °C and only minor differences exist in the dislocation arrangements formed under pure fatigue and combined creep and fatigue conditions. Hence, a unified constitutive model seems to be justified in describing and predicting the constitutive behaviour in both cases. Keywords: Constitutive modelling; Nickel-based superalloy; Fatigue; Fatigue–creep interaction; Microstructure;
    Original languageEnglish
    Pages (from-to)27-34
    Number of pages8
    JournalMaterials Science and Engineering: A
    Volume518
    Issue number1-2
    DOIs
    Publication statusPublished - Aug 2009

    Fingerprint

    Dive into the research topics of 'Microstructural characterisation and constitutive behaviour of alloy RR1000 under fatigue and creep–fatigue loading conditions'. Together they form a unique fingerprint.

    Cite this