Oxidation of Metals

, Volume 32, Issue 3–4, pp 167–184 | Cite as

Scale formation on the Ni-base superalloys IN 939 and IN 738 LC

  • J. Litz
  • A. Rahmel
  • M. Schorr
  • J. Weiss
Article

Abstract

The scales formed on the superalloys IN 939 and IN 738 LC at 700, 900, and 1100°C in air have been investigated by optical, microprobe analysis and x-ray diffraction measurements. Both alloys form very similar scales. The main components are an outer TiO2 layer, an intermediate Cr2O3 layer with dissolved Ti, and an inner layer of (Ti, Nb, Ta)O2 with rutile structure. Beneath the scale an internal corrosion zone is formed that contained Al2O3 directly beneath the external scale and TiN further into the substrate.

Key words

Superalloy scale formation internal corrosion 

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Copyright information

© Plenum Publishing Corporation 1989

Authors and Affiliations

  • J. Litz
    • 1
  • A. Rahmel
    • 1
  • M. Schorr
    • 1
  • J. Weiss
    • 2
  1. 1.Dechema-InstitutFrankfurt am Main 97Federal Republic of Germany
  2. 2.ABB Asea Brown Boveri AGMannheim 1Federal Republic of Germany

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