The effect of minimum dwell cycles on the environmental and fatigue response of RR1000

J H O'Hanlon, M C Hardy, D J Child, B Foss, P J Withers, M R Bache

    Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

    Abstract

    Minimum dwell fatigue testing of nickel based superalloy FG RR1000 at 650 degrees C has led to significant reductions in fatigue life. The reduction in fatigue life under minimum dwell fatigue has been caused by relatively early and multiple crack initiation events from a highly oxidised surface. The depth of oxidation damage, in the present circumstances achieved under cyclic loading at 650 degrees C, appeared similar to previous stress free isothermal exposure studies conducted on RR1000 but at higher temperature/shorter duration suggesting an enhancement in oxidation due to applied stress. Surface oxidation and crack initiation were clearly resisted under the baseline loading cycle despite being exposed for similar periods of exposure time. To understand the respective effects of the environment and minimum dwell period, vacuum fatigue and hold time oxidation tests have been completed.
    Original languageEnglish
    Title of host publication2nd European Symposium on Superalloys and their Applications (EUROSUPERALLOYS 2014) Giens, France, 12-16 May 2014
    EditorsJ Guedou
    PublisherCurran Associates Incorporated
    ISBN (Print)9781634393232
    DOIs
    Publication statusPublished - 2014

    Publication series

    NameMATEC web of conferences
    Volume14

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