Effects of microstructure, temperature and R-ratio on fatigue crack propagation and threshold behaviour in two Ni-base alloys

J.E. King*, R.A. Venables, M.A. Hicks

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingConference publication

    Abstract

    Fatigue crack propagation and threshold data for two Ni-base alloys, Astroloy and Nimonic 901, are reported. At room temperature the effect which altering the load ratio (R-ratio) has on fatigue behaviour is strongly dependent on grain size. In the coarse grained microstructures crack growth rates increase and threshold values decrease markedly as R rises from 0. 1 to 0. 8, whereas only small changes in behaviour occur in fine grained material. In Astroloy, when strength level and gamma grain size are kept constant, there is very little effect of processing route and gamma prime distribution on room temperature threshold and crack propagation results. The dominant microstructural effect on this type of fatigue behaviour is the matrix ( gamma ) grain size itself.
    Original languageEnglish
    Title of host publicationAdvances in fracture research
    Subtitle of host publicationproceedings of the 6th International Conference on Fracture (ICF6) New Delhi, India, 4-10 December 1984
    EditorsS.R. Taplin, D.M.R. Rao, P. Rama, J.F. Knott, R. Dubey, S.R. Valluri
    Place of PublicationOxford (UK)
    PublisherPergamon Press
    Pages2081-2089
    Number of pages9
    ISBN (Print)0-080-29309-3, 978-0-080-29309-7
    Publication statusPublished - 1 Dec 1984
    Event6th International Conference on Fracture - New Delhi, India
    Duration: 4 Dec 198410 Dec 1984

    Conference

    Conference6th International Conference on Fracture
    Abbreviated titleICF6
    CountryIndia
    CityNew Delhi
    Period4/12/8410/12/84

    Keywords

    • fatigue of materials
    • astroloy fracture surfaces
    • elevated temperature threshold values
    • fatigue crack propagation
    • microstructure temperature
    • threshold values
    • nickel and alloys

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