Effect of compressive dwell on low cycle fatigue behaviour of nickel based single crystal alloy at 1100°C

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DOIResolve DOI: http://doi.org/10.1179/1879139511Y.0000000016
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TypeArticle
Journal titleCanadian Metallurgical Quarterly
Volume50
Issue3
Pages303310; # of pages: 8
SubjectFatigue; Creep-Fatigue; Single-Crystal; Superalloy; CMSX-2
AbstractIn this study, the low cycle fatigue behaviour of CMSX-2 oriented with the loading axis along [001] was investigated under zero compression (Rϵ = −∞) strain controlled loading at 1100°C. The experiments were performed with or without a 2 min dwell (hold) in compression at strain ranges of 0·7, 0·6 and 0·5%. Stress relaxation was observed to occur resulting in the development of tensile mean stress under dwell fatigue loading and zero mean stress under non-dwell fatigue loading conditions. Fatigue cracks were observed to originate from localised regions of oxide attack at the specimen surface. The surface fatigue cracks initially propagated perpendicular to the stress axis but transitioned to other crystallographic planes at larger crack sizes and after the coalescence of multiple fatigue cracks. Non-dwell fatigue loading promoted isotropic coarsening of the γ′ precipitates while compressive dwell fatigue loading resulted in γ′ rafting parallel to the loading direction. It was observed that CMSX-2 was compressive dwell sensitive and exhibited fatigue lives 3–6 times shorter than non-dwell tests under the same total strain ranges.
Publication date
LanguageEnglish
AffiliationNRC Institute for Aerospace Research; National Research Council Canada
Peer reviewedYes
NPARC number19726607
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Record identifierff15d8f5-83b4-4a3d-8561-3c3869b0e202
Record created2012-03-26
Record modified2016-05-09
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