Startseite Technik High temperature stability of Cr-carbides in an experimental Co–Re-based alloy
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High temperature stability of Cr-carbides in an experimental Co–Re-based alloy

  • Debashis Mukherji , Michael Klauke , Pavel Strunz , Ivo Zizak , Gerhard Schumacher , Albrecht Wiedenmann und Joachim Rösler
Veröffentlicht/Copyright: 11. Juni 2013
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International Journal of Materials Research
Aus der Zeitschrift International Journal of Materials Research Band 101 Heft 3

Abstract

The stability of the microstructure at high temperatures was studied in an experimental Co–Re-based alloy. The experimental alloy is mainly strengthened by Cr-carbides, particularly by those in the form of thin lamellar plates. Electron microscopic investigation on samples exposed for up to 1 000 h to temperatures of 1 000 and 1 200 °C showed that Cr23C6 type carbides present in the alloy in different morphologies are unstable at these temperatures. It was also observed that the alloy hardness dropped after exposing the samples to elevated temperatures and much of this loss occurred within the first 100 h. In-situ diffraction measurements with synchrotron radiation showed that carbide dissolution started as early as 3 h of holding at 1 000 °C. Moreover, in-situ small angle neutron scattering results indicated that the carbides at the grain boundaries and the blocky carbides dissolve first and then the thin lamellar carbides. Further, the enrichment of Cr in the Co-matrix phase, which took place due to the dissolution of Cr-carbides, stabilized a Cr–Re-rich σ phase. Although the dissolution of lamellar carbides results in a significant loss of strength, the formation of σ phase with extremely high hardness partly compensated the for loss. The σ phase is stable even at 1 200 °C.

Keywords: Co-Re base alloy; Cr-carbide stability; Electron microscopy; Synchrotron; Small angle neutron scattering
* 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: 2008-10-14
Accepted: 2009-5-13
Published Online: 2013-06-11
Published in Print: 2010-03-01

© 2010, Carl Hanser Verlag, München

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Basic
  4. The study of recrystallisation and crystallographic texture genesis in industrial steels
  5. Properties of copper composites strengthened by nano- and micro-sized Al2O3 particles
  6. High temperature stability of Cr-carbides in an experimental Co–Re-based alloy
  7. Growth and structure of NdGaO3 films prepared by metal–organic deposition
  8. On the composition and pressure dependence of the self-diffusion coefficient in liquid metals
  9. The relationship between the microstructure and the magnetic properties of nano-scale magnetic particles in a Cu–Fe–Co ternary alloy
  10. The microstructure and magnetic properties of nano-scale Fe magnetic particles precipitated in a Cu–Fe alloy
  11. The effect of grain size on the corrosion inhibitor adsorption of nanocrystalline iron metal
  12. Applied
  13. In-situ observation of creep damage evolution in Al–Al2O3 MMCs by synchrotron X-ray microtomography
  14. The effect of grain refiner and combined electro-magnetic field on grain evolution of horizontal direct chill casting 7075 aluminum alloy
  15. Luminescence of aqueous reactions derived NiWO4 powders and sol-gel deposited films
  16. Thermo-mechanical modeling of friction stir welding
  17. Phase transformation temperatures of pure iron and low alloyed steels in the low temperature region using DTA
  18. Effect of ECAE conditions on the microstructure, texture and mechanical properties of an extruded Mg–Zn–Y–Zr alloy
  19. Heat transfer analysis of special reinforced NSC-columns under severe fire conditions
  20. High-speed milling strategies in mould manufacturing
  21. Effect of solution heat treatment on the age hardening capacity of dendritic and globular AlSi7Mg0.6 alloys
  22. Notification
  23. DGM News
https://doi.org/10.3139/146.110282
Schlagwörter für diesen Artikel
Co-Re base alloy; Cr-carbide stability; Electron microscopy; Synchrotron; Small angle neutron scattering

Artikel in diesem Heft

  1. Contents
  2. Contents
  3. Basic
  4. The study of recrystallisation and crystallographic texture genesis in industrial steels
  5. Properties of copper composites strengthened by nano- and micro-sized Al2O3 particles
  6. High temperature stability of Cr-carbides in an experimental Co–Re-based alloy
  7. Growth and structure of NdGaO3 films prepared by metal–organic deposition
  8. On the composition and pressure dependence of the self-diffusion coefficient in liquid metals
  9. The relationship between the microstructure and the magnetic properties of nano-scale magnetic particles in a Cu–Fe–Co ternary alloy
  10. The microstructure and magnetic properties of nano-scale Fe magnetic particles precipitated in a Cu–Fe alloy
  11. The effect of grain size on the corrosion inhibitor adsorption of nanocrystalline iron metal
  12. Applied
  13. In-situ observation of creep damage evolution in Al–Al2O3 MMCs by synchrotron X-ray microtomography
  14. The effect of grain refiner and combined electro-magnetic field on grain evolution of horizontal direct chill casting 7075 aluminum alloy
  15. Luminescence of aqueous reactions derived NiWO4 powders and sol-gel deposited films
  16. Thermo-mechanical modeling of friction stir welding
  17. Phase transformation temperatures of pure iron and low alloyed steels in the low temperature region using DTA
  18. Effect of ECAE conditions on the microstructure, texture and mechanical properties of an extruded Mg–Zn–Y–Zr alloy
  19. Heat transfer analysis of special reinforced NSC-columns under severe fire conditions
  20. High-speed milling strategies in mould manufacturing
  21. Effect of solution heat treatment on the age hardening capacity of dendritic and globular AlSi7Mg0.6 alloys
  22. Notification
  23. DGM News
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