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

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dc.contributor.author Potter, Andrew
dc.contributor.author Sumner, Joy
dc.contributor.author Nigel, Simms
dc.date.accessioned 2018-01-29T09:44:02Z
dc.date.available 2018-01-29T09:44:02Z
dc.date.issued 2017-10-07
dc.identifier.citation A. Potter, J. Sumner and N Simms. The role of superalloy precipitates on the early stages of oxidation and type II hot corrosion. Available onlu=ine 7 November 2017 en_UK
dc.identifier.issn 0960-3409
dc.identifier.uri https://doi.org/10.1080/09603409.2017.1392413
dc.identifier.uri http://dspace.lib.cranfield.ac.uk/handle/1826/12933
dc.description.abstract To 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.language.iso en en_UK
dc.rights Attribution-NonCommercial 4.0 International *
dc.rights.uri http://creativecommons.org/licenses/by-nc/4.0/ *
dc.subject Oxidation en_UK
dc.subject hot corrosion en_UK
dc.subject superalloys en_UK
dc.subject MarM 509 en_UK
dc.subject Rene 80 en_UK
dc.title The role of superalloy precipitates on the early stages of oxidation and type II hot corrosion en_UK
dc.type Article en_UK


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