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Microstructure and Creep Behavior of Fe-27Al-1Nb Alloys with Added Carbon

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Abstract

The effect of Nb and C additions on the phase composition, microstructure, and creep resistance of Fe3Al-type alloys is investigated. Two alloys, which contained (at. pct) (i) 27.6 Al, 1.15 Nb and 0.19 C (Fe balance) and (ii) 27.1 Al, 1.11 Nb, and 0.76 C (Fe balance), were studied in a temperature range from 873 K to 1073 K (600 °C to 800 °C). The carbide in both alloys was identified as Nb6C5. The creep data can be rationalized by introducing a threshold stress, below which, the creep rate is negligible. The threshold stress and an effective stress exponent were found simultaneously by a numerical method. Using the obtained values of the threshold stress, the activation energy of creep was determined to be 328 kJ/mol. The effective stress exponent varied from 2.0 to 3.1. A breakdown of power-law behavior was observed at higher stresses. The transition occurred at the normalized creep rate of \( \dot{\varepsilon }/D = 10^{13} \,{\text{m}}^{ - 2} \), which agrees with the rule suggested by Sherby and Burke and the diffusion coefficient D corresponding to the diffusion of Al in Fe-Al.

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Acknowledgments

The paper is based on work supported by the Grant Agency of the Czech Republic within the Project 108/12/1452.

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Authors and Affiliations

  1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, 616 62, Brno, Czech Republic

    Ferdinand Dobeš (Senior Researcher)

  2. Department of Physics of Materials, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 5, 121 16, Prague 2, Czech Republic

    Petr Kratochvíl (Professor) & Josef Pešička (Associate Professor)

  3. Department of Material Science, Faculty of Mechanical Engineering, Technical University of Liberec, Hálkova 6, 461 17, Liberec 1, Czech Republic

    Věra Vodičková (Senior Assistant Professor)

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  1. Ferdinand Dobeš
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  2. Petr Kratochvíl
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  4. Věra Vodičková
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Correspondence to Ferdinand Dobeš.

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Manuscript submitted August 5, 2014.

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Dobeš, F., Kratochvíl, P., Pešička, J. et al. Microstructure and Creep Behavior of Fe-27Al-1Nb Alloys with Added Carbon. Metall Mater Trans A 46, 1580–1587 (2015). https://doi.org/10.1007/s11661-015-2756-0

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  • DOI: https://doi.org/10.1007/s11661-015-2756-0

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