Effects of dynamic strain ageing on fatigue crack propagation and threshold behaviour in a Ni-base superalloy

R.A. Venables, J.E. King

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

    Abstract

    In the temperature range 200-400 degree C the Ni-base superalloy, N901, develops marked dynamic strain ageing effects in its tensile behavior. These include inverse strain rate sensitivity, especially in UTS values, strongly serrated stress-strain curves and a heavily sheared failure mode at the higher test-temperatures. As for steels these effects seem to be due to interactions between the dislocations and the interstitial carbon atoms present. The results of tensile and fatigue threshold tests carried out between 20 degree C and 420 degree C are reported and the fatigue behavior is discussed in terms of the effects of surface roughness induced closure, temperature and strain aging interactions.
    Original languageEnglish
    Title of host publicationFatigue 84
    Subtitle of host publicationproceedings of the 2nd International conference on fatigue and fatigue thresholds; Birmingham, 3-7 September 1984
    EditorsC.J. Beevers, J. Backlund, P. Lukacs, J. Schijve, R.O. Ritchie
    Pages1371-1378
    Number of pages8
    Volume3
    Publication statusPublished - Dec 1984
    Event2nd international conference on fatigue and fatigue thresholds - Birmingham, United Kingdom
    Duration: 3 Sep 19847 Sep 1984

    Conference

    Conference2nd international conference on fatigue and fatigue thresholds
    Abbreviated titleFatigue 84
    CountryUnited Kingdom
    CityBirmingham
    Period3/09/847/09/84

    Keywords

    • measurements fatigue of materials
    • fatigue gas turbines
    • high temperature metals testing
    • dynamic strain ageing
    • near-threshold fatigue cracks
    • serrated stress-strain curves
    • super alloy N901
    • turbine-discs
    • nickel and alloys

    Fingerprint Dive into the research topics of 'Effects of dynamic strain ageing on fatigue crack propagation and threshold behaviour in a Ni-base superalloy'. Together they form a unique fingerprint.

    Cite this