Low temperature hot corrosion screening of single crystal superalloys

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dc.contributor.authorSmialek, James L.
dc.contributor.authorGray, Simon
dc.date.accessioned2018-10-26T14:23:46Z
dc.date.available2018-10-26T14:23:46Z
dc.date.issued2018-10-25
dc.description.abstractSingle crystal superalloys were screened in Type II molten (Na,K)-sulfate hot corrosion re-coat tests in air +300 ppm SO2 at 700 °C. They exhibited large 20–40 mg/cm2 weight changes, repeated spallation, and non-protective, 25–50 μm thick corrosion layers after 300 h of testing. Scale cross sections revealed dual outer Ni(Co)O and inner Al(Cr)S-rich corrosion layers. This chemical differentiation was partially consistent with previous models of oxide fluxing, alloy sulfidation, NiO micro-channel diffusion, and synergistic dissolution mechanisms. Broad shallow pits or uniform attack morphologies were consistent with prior studies performed in high >100 ppm pSO2 environments. Higher Mo experimental alloys trended toward more degradation, producing 100 μm thick scales with distinct Al(Cr)S-rich inner layers or 500 μm thick NiO. The aggressive behavior in these environments supports the need for LTHC-resistant coatings for single crystal superalloys.en_UK
dc.identifier.citationJames L. Smialek and Simon Gray. Low temperature hot corrosion screening of single crystal superalloys. Materials, 2018, Volume 11, Issue 11, Article number 2098en_UK
dc.identifier.issn1996-1944
dc.identifier.urihttps://doi.org/10.3390/ma11112098
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/13584
dc.language.isoenen_UK
dc.publisherMDPIen_UK
dc.rightsAttribution 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectType II hot corrosionen_UK
dc.subjectsingle crystal superalloysen_UK
dc.subjectmolten salten_UK
dc.titleLow temperature hot corrosion screening of single crystal superalloysen_UK
dc.typeArticleen_UK

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