Effect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4

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dc.contributor.authorBrooking, Laurie
dc.contributor.authorGray, Simon
dc.contributor.authorSumner, Joy
dc.contributor.authorNicholls, John R.
dc.contributor.authorMarchant, G.
dc.contributor.authorSimms, Nigel J.
dc.date.accessioned2018-07-30T15:12:36Z
dc.date.available2018-07-30T15:12:36Z
dc.date.issued2018-05-03
dc.description.abstractOperating conditions within industrial gas turbines are changing in response to pressures to reduce environmental impact and enable use of renewable sources. This is driving an increase in the operational temperatures and pressures of combustion in turbine systems. Additionally, diverse operating environments can result in higher sulphur and trace metal contaminant levels, exacerbating hot corrosion in GT systems. Low cycle fatigue (LCF) cycling can also be intensified as a result of increased start/stop shutdowns. The combined effects of hot corrosion and stress are experimentally studied on CMSX-4 single crystal (SC) γ/γ' system under both fatigue and static stress conditions, with either a multi-axial bending or uniaxial stress state. The associated stress intensity thresholds (KTH) under the various stress conditions were evaluated using finite element analysis (FEA). Cracking was observed both under static and fatigue stress conditions in a hot corrosion environment. Crack morphologies were analysed using SEM techniques. Bending stresses and fatigue cycles demonstrated increased crack propagation in the presence of hot corrosion with static uniaxial stresses showing the longest nucleation times and lowest propagation rates.en_UK
dc.identifier.citationL. Brooking, S. Gray, J. Sumner, et al., Effect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4. International Journal of Fatigue, Volume 116, November 2018, Pages 106-117en_UK
dc.identifier.cris20558848
dc.identifier.issn0142-1123
dc.identifier.urihttps://doi.org/10.1016/j.ijfatigue.2018.05.002
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/13365
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHot corrosionen_UK
dc.subjectFracture mechanicsen_UK
dc.subjectFEAen_UK
dc.subjectSingle crystal superalloysen_UK
dc.titleEffect of stress state and simultaneous hot corrosion on the crack propagation and fatigue life of single crystal superalloy CMSX-4en_UK
dc.typeArticleen_UK

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