Mechanical stress effects on 550°C hot corrosion propagation rates in precipitation hardened Ni-base superalloys: CMSX-4, CM247LC DS and IN6203DS

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dc.contributor.authorChapman, Neil
dc.contributor.authorGray, Simon
dc.contributor.authorSumner, Joy
dc.contributor.authorNicholls, John R.
dc.date.accessioned2022-01-05T14:31:57Z
dc.date.available2022-01-05T14:31:57Z
dc.date.issued2021-12-10
dc.description.abstractCombinations of temperature, stress and hot corrosion may cause environmentally-assisted cracking in precipitation-hardened Ni-base superalloys, which is little understood. This research aims to increase current understanding by investigating the effects of mechanical stress on the hot corrosion propagation rate during corrosion-fatigue testing of CMSX-4, CM247LC DS and IN6203DS. The parameters used during the tests included a high R-ratio, high frequency, and a temperature of 550 °C. The results showed CMSX-4 experienced a predictable increase in the hot corrosion rate, CM247LC DS also experienced increased rates, but no obvious trend was apparent; whilst IN6203DS showed no evidence of an increased rate. These different behaviours appear to be a result of an interaction between the mechanical stress and microstructural features, which include gamma-prime volume fractions in both the matrix and eutectic regions, along with the distribution of the eutectic structure. The different behaviours in the hot corrosion propagation rate subsequently affected the respective corrosion fatigue results, with both CMSX-4 and CM247LC DS experiencing fracture but with significantly more scatter involved in the CM247LC DS results. All IN6203DS corrosion-fatigue specimens completed the respective tests without fracture and showed no evidence of cracking. It, therefore, appears that precipitation hardened Ni-base superalloys, which are susceptible to environmentally-assisted cracking, also experience increased hot corrosion propagation rates.en_UK
dc.identifier.citationChapman N, Gray S, Sumner J, Nicholls J. (2022) Mechanical stress effects on 550°C hot corrosion propagation rates in precipitation hardened Ni-base superalloys: CMSX-4, CM247LC DS and IN6203DS, Oxidation of Metals, Volume 97, Issue 3-4, April 2022, pp. 261–279en_UK
dc.identifier.eissn1573-4889
dc.identifier.issn0030-770X
dc.identifier.urihttps://doi.org/10.1007/s11085-021-10089-w
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/17365
dc.language.isoenen_UK
dc.publisherSpringeren_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectHigh-temperature mechanical propertiesen_UK
dc.subjectStrengthening mechanismsen_UK
dc.titleMechanical stress effects on 550°C hot corrosion propagation rates in precipitation hardened Ni-base superalloys: CMSX-4, CM247LC DS and IN6203DSen_UK
dc.typeArticleen_UK

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