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Oxidation behaviour of experimental Co–Re-base alloys in laboratory air at 1000°C

  • Michael Klauke , Debashis Mukherji , Bronislava Gorr , Vicente Braz da Trindade Filho , Joachim Rösler and Hans-Jürgen Christ
Published/Copyright: June 11, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 100 Issue 1

Abstract

The oxidation behaviour of experimental Co – Re-based alloy at 1000 °C was studied. A set of binary, ternary and quaternary alloys from the Co – Re – Cr – C system was used as model alloys to understand the role each alloying element plays on oxidation. The morphology and composition of the oxide scale that formed was analysed by X-ray diffraction, energy dispersive spectroscopy and scanning electron microscopy. It was found that the present Co – Re alloys with 23 at.% and 30 at.% Cr additions behaved very similarly to Co – Cr binary alloys with equivalent Cr content. The oxide scale was multilayered, consisting of a dense CoO outer layer, a porous mixed oxide layer containing Co-oxide and Co – Cr spinel, and a discontinuous and non-protective Cr3O2 layer. The binary Co – Re alloy behaved differently in oxidation, and it formed only a monolithic CoO scale. However, Re in combination with Cr promotes Cr – Re-rich phase formation, which oxidises preferentially compared to the Co matrix. Carbon ties up part of the Cr to form Cr23C6 type carbides. However, these carbides are not stable at 1000 °C and dissolved with time, therefore C had only a minor role in the oxidation behaviour. In general, increasing Cr content in the alloy improved oxidation resistance.

Keywords: Co-base alloy; Rhenium; Oxidation; Cr and C addition; Multilayered scale formation
* Correspondence address, Dr. Debashis Mukherji, Technical University Braunschweig, IfW, Langer Kamp 8, D-38106 Braunschweig, Germany, Tel.: +49 531 391 3062, Fax: +49 531 391 3058, E-mail:

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Received: 2008-6-19
Accepted: 2008-9-30
Published Online: 2013-06-11
Published in Print: 2009-01-01

© 2009, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.101792
Keywords for this article
Co-base alloy; Rhenium; Oxidation; Cr and C addition; Multilayered scale formation

Articles in the same Issue

  1. Contents
  2. Contents
  3. Editorial
  4. Editorial
  5. Congratulations
  6. The 100th Volume of “International Journal of Materials Research” – the DGM congratulates!
  7. Feature
  8. The anatomy of the International Journal of Materials Research1 in the light of bibliometry
  9. Verhakungen, dislocations, solitons, and kinks
  10. Review
  11. Do we need a new conference series for the German materials community?
  12. Basic
  13. Bainite orientation in plastically deformed austenite
  14. Microstructure evolution during a liquid–liquid decomposition under the common action of the nucleation, growth and Ostwald ripening of droplets
  15. Surface tension of liquid binary alloys – theory versus experiment
  16. Reassessment of the Ni–B system supported by key experiments and first-principles calculation
  17. A combined microtensile testing and nanoindentation study of the mechanical behavior of nanocrystalline LIGA Ni–Fe
  18. Effect of electropulsing on the tensile flow stress of ultrafine-grained 3Y-TZP at 1400°C
  19. Applied
  20. Experimental survey on fluid brazing in ancient goldsmith' art
  21. Correlation between heat treatment, microstructure and mechanical properties of a hot-work tool steel
  22. Study of near surface changes in yttria-doped tetragonal zirconia after low temperature degradation
  23. Thermographic analysis of AlSi12 during crystallisation as a function of cooling rate
  24. Oxidation behaviour of experimental Co–Re-base alloys in laboratory air at 1000°C
  25. Notification
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