Chromia layer growth on a Ni-based superalloy : sub-parabolic kinetics and the role of titanium

S. Cruchley, Hugh Evans, Mary Taylor, M. C. Hardy, S. Stekovic

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Abstract

Oxidation of the Ni-based superalloy RR1000 has been undertaken in air over the temperature range 600–900 °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.
Original languageEnglish
Pages (from-to)58-66
Number of pages9
JournalCorrosion Science
Volume75
Early online date7 Jun 2013
DOIs
Publication statusPublished - Oct 2013

Keywords

  • A. Superalloys
  • C. Oxidation
  • C. Selective Oxidation

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