Characterisation of subsurface oxidation damage in Ni based superalloy, RR1000

Research output: Contribution to journalArticle

Authors

Colleges, School and Institutes

External organisations

  • Rolls Royce

Abstract

Isothermal oxidation of the Ni based superalloy, RR1000, has been performed at 700, 750 and 800°C for exposure periods up to 2000 h. A chromia external oxide scale with an outer layer of rutile was formed together with extensive internal oxidation of aluminium, both intragranularly and intergranularly. The internal oxidation was associated with a deeper γ′ particle free zone. Extensive metallographic measurements of both the depth of internal oxidation and of the γ′ particle free zone were made. The kinetics in each case approximated well to parabolic. Possible rate controlling processes are discussed.

Details

Original languageEnglish
Pages (from-to)1884-1889
Number of pages6
JournalMaterials Science and Technology
Volume30
Issue number15
Early online date14 Apr 2014
Publication statusPublished - 2014

Keywords

  • oxidation , internal oxide , Al2O3 , Ni based superalloy