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Evaluation of Solid-Solution Hardening of Fe-27 at. pct Al by Vanadium and Comparison to Precipitation Strengthening by Vanadium Carbides

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Abstract

The compressive yield stress of Fe-27Al-xV(-C) (x = 0 to 4 at. pct) at 1073 K (800 °C) has been determined. The increase of the yield stress of Fe-Al by increasing vanadium content is explained by solid-solution hardening. The experimentally observed values of the yield stress at 1073 K (800 °C) are compared with the strengthening given by theories evaluating the interaction between solute atoms and dislocations. The experimental results fit well the increase of the yield stress by the interaction of the solute atoms with screw dislocations. Further increase in yield strength in similar alloys due to vanadium carbides is documented. Precipitated carbides were identified by transmission electron microscopy and Kikuchi patterns. Although precipitation of vanadium carbides increases the compressive yield stress, they also could result in premature failure in tension as their highly anisotropic shape may facilitate crack nucleation.

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Acknowledgments

The paper is based on the research supported by the Grant Agency of the Czech Republic within the Project No. 108/12/1452. The FAVC 1 alloy was supplied by I. Çelikyürek of Eskişehir Osmangazi University in Turkey and by O.Torun of Afyon Kocotepi University in Turkey.

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Authors and Affiliations

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

    Petr Kratochvíl (Professor), Josef Pešička (Associate Professor) & Robert Král (Associate Professor)

  2. Department of Material Science, Faculty of Mechanical Engineering, Technical University in Liberec, Studentska 2, 461 17, Liberec 1, Czech Republic

    Martin Švec (Junior Researcher)

  3. Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str.1, 40237, Düsseldorf, Germany

    Martin Palm (Senior Researcher)

Authors
  1. Petr Kratochvíl
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  2. Josef Pešička
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  3. Robert Král
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  4. Martin Švec
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  5. Martin Palm
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Corresponding author

Correspondence to Petr Kratochvíl.

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Manuscript submitted March 2, 2015.

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Kratochvíl, P., Pešička, J., Král, R. et al. Evaluation of Solid-Solution Hardening of Fe-27 at. pct Al by Vanadium and Comparison to Precipitation Strengthening by Vanadium Carbides. Metall Mater Trans A 46, 5091–5094 (2015). https://doi.org/10.1007/s11661-015-3106-y

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