Chromia layer growth on a Ni-based superalloy: Sub-parabolic kinetics and the role of titanium
2013 (English)In: Corrosion Science, ISSN 0010-938X, E-ISSN 1879-0496, Vol. 75, 58-66 p.Article in journal (Refereed) Published
Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600-900 degrees C for times up to 5000 h. The surface oxide consisted of a protective Ti-doped chromia layer but with rutile forming on its outer surface. Sub-surface oxidation of Al and Ti also occurred. The thickening kinetics of the chromia layer were sub-parabolic with initial rates around two orders of magnitude higher than expected for Ti-free chromia. This enhancement and the sub-parabolic kinetics are accounted for by Ti-doping of the chromia layer. Over time the enhancement reduced because of Ti-depletion in the alloy.
Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 75, 58-66 p.
Superalloys, Oxidation, Selective Oxidation
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-97430DOI: 10.1016/j.corsci.2013.05.016ISI: 000323469800006OAI: oai:DiVA.org:liu-97430DiVA: diva2:647900
Funding Agencies|Engineering and Physical Sciences Research Council||Rolls-Royce plc||2013-09-122013-09-122014-09-11