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Oxidation of Metals

, Volume 90, Issue 1–2, pp 119–133 | Cite as

Stability of External α-Al2O3 Scales on Alloy 602 CA at 1100–1200 °C

  • A. Chyrkin
  • R. Swadźba
  • R. Pillai
  • T. Galiullin
  • E. Wessel
  • D. Grüner
  • W. J. Quadakkers
Original Paper
  • 141 Downloads

Abstract

An external ultrathin α-Al2O3 scale grown on the Ni-base alloy 602 CA during air oxidation at 800 °C was characterized by means of high-resolution TEM/EDX and electron diffraction. Alloy samples pre-oxidized at 800 °C were subsequently exposed at 1100, 1150 and 1200 °C for up to 100 h. Whereas the external alumina remained stable at 1100 °C, with the increasing exposure temperature, the pre-grown alumina scale tended to break down resulting in an external chromia scale accompanied by internal alumina precipitation. The transition from external to internal Al oxidation was investigated using SEM/EDX/EBSD. The critical Al depletion at the scale-alloy interface during the post-exposure at 1100–1200 °C was modeled using the CALPHAD-based thermodynamic-kinetic approach.

Keywords

Alloy 602 CA Internal oxidation Alumina scales Depletion Breakaway Pre-oxidation 

Notes

Acknowledgements

The authors are grateful to Dr. H. Hattendorf from VDM Metals (Werdohl, Germany) for providing a batch of 602 CA. Mr. H. Cosler is kindly acknowledged for carrying out oxidation tests.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Institute for Energy and Climate Research IEK-2Forschungszentrum Jülich GmbHJülichGermany
  2. 2.Department of ChemistryTaras Shevchenko National University of KyivKievUkraine
  3. 3.Applied Physics, Materials CharacterizationChalmers University of TechnologyGöteborgSweden
  4. 4.Institute for Ferrous MetallurgyGliwicePoland

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