The role of superalloy precipitates on the early stages of oxidation and type II hot corrosion

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dc.contributor.authorPotter, Andrew
dc.contributor.authorSumner, Joy
dc.contributor.authorNigel, Simms
dc.date.accessioned2018-01-29T09:44:02Z
dc.date.available2018-01-29T09:44:02Z
dc.date.issued2017-10-07
dc.description.abstractTo meet materials challenges encountered in gas turbines, superalloys have been developed for high temperature, strength, oxidation and corrosion resistance. One strengthening method is using refractory metal additions to form carbide precipitates. However, such precipitates may be detrimental to the alloy’s environmental resistance. This paper reports how refractory metal carbide precipitates affect the early stages of oxidation and hot corrosion of two alloys: Rene 80 (nickel-based) and MarM 509 (cobalt-based). Samples were exposed at 700 °C in either dry synthetic air or 90 ppm SOx, 10·5% CO2, 8·5% O2, 5% H2O (balance N2) with a 80/20 (Na/K)2SO4 deposit (1·5 μg/cm2/hour flux). The oxidation morphology and corrosion products were investigated by scanning electron microscope and energy dispersive X-ray analysis, to show that refractory metal carbide precipitates close to the metal surfaces disrupt protective oxide scale formation, thus providing inward transport routes for corrosive species.en_UK
dc.identifier.citationPotter A, Sumner J, Simms NJ. (2018) The role of superalloy precipitates on the early stages of oxidation and type II hot corrosion. Materials at High Temperatures, Volume 35, Issue 1-3, 2018, pp. 236-242en_UK
dc.identifier.issn0960-3409
dc.identifier.urihttps://doi.org/10.1080/09603409.2017.1392413
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12933
dc.language.isoenen_UK
dc.rightsAttribution-NonCommercial 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/*
dc.subjectOxidationen_UK
dc.subjecthot corrosionen_UK
dc.subjectsuperalloysen_UK
dc.subjectMarM 509en_UK
dc.subjectRene 80en_UK
dc.titleThe role of superalloy precipitates on the early stages of oxidation and type II hot corrosionen_UK
dc.typeArticleen_UK

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