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Optimization of Cr-Content for High-Temperature Oxidation Behavior of Co–Re–Si-Base Alloys

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Abstract

The oxidation behavior of Co-17Re-xCr-2Si alloys containing 23, 25, 27 and 30 at.% chromium at 1,000 and 1,100 °C were investigated. Alloy Co–17Re–23Cr–2Si showed a poor oxidation resistance during exposure to laboratory air forming a two-layer external scale and a very thin discontinuous Cr2O3 layer at the oxide/substrate interface. The outer layer of the oxide scale consisted of CoO, whereas the inner layer was a porous mixture of CoCr2O4 spinel particles in a CoO matrix. The oxide scale was found to be non-protective in nature as the vaporization of Re-oxide took place during oxidation. An increase of chromium content from 23 at.% to 25 at.% improved significantly the alloy oxidation resistance; a compact protective Cr2O3-scale formed and prevented the rhenium oxide evaporation. The oxidation behavior of alloys containing 27 at.% and 30 at.% chromium were quite similar to that of Co–17Re–25Cr–2Si. The oxidation mechanism for Co–17Re–25Cr–2Si alloy was established and the subsurface microstructural changes were investigated by means of EBSD characterization.

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Acknowledgments

Financial support of Deutsche Forschungsgemeinschaft (DFG) in the framework of Research Group “Beyond Ni-Base Superalloys” is gratefully acknowledged.

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Authors and Affiliations

  1. Institut für Werkstofftechnik, Universität Siegen, Paul-Bonatz-Straße 9-11, 57068, Siegen, Germany

    Lin Wang, Bronislava Gorr & Hans-Jürgen Christ

  2. Institut für Werkstoffe, TU Braunschweig, Langer Kamp 8, 38106, Braunschweig, Germany

    Debashis Mukherji & Joachim Rösler

Authors
  1. Lin Wang
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  2. Bronislava Gorr
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  3. Hans-Jürgen Christ
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  4. Debashis Mukherji
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  5. Joachim Rösler
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Correspondence to Lin Wang.

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Wang, L., Gorr, B., Christ, HJ. et al. Optimization of Cr-Content for High-Temperature Oxidation Behavior of Co–Re–Si-Base Alloys. Oxid Met 80, 49–59 (2013). https://doi.org/10.1007/s11085-013-9369-z

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  • DOI: https://doi.org/10.1007/s11085-013-9369-z

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