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Charakterisierung einer β-erstarrenden γ-TiAl-Basislegierung

Characterization of a β-Solidified γ-TiAl alloy

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Zusammenfassung

Herkömmliche hoch Nb-haltige Titanaluminid-Legierungen zeigen auf Grund ihrer peritektischen Erstarrung relativ starke Seigerungen im Gusszustand als auch nach dem Strangpressen. Damit verbunden sind auch lokale Schwankungen in der Mikrostruktur, die zu nicht reproduzierbaren mechanischen Eigenschaften führen. Die Legierung Ti-43Al-4Nb-1 Mo-0,1B (At. %) zeigt im Gusszustand ein homogenes und feines Gefüge, was auf die Erstarrung über die kubische β-Phase zurückzuführen ist. Durch zusätzliche Wärmebehandlungen konnte gezeigt werden, dass unterschiedliche Gefügemodifikationen und ein noch feineres und homogeneres Gefüge einstellbar sind. Durch Zugversuche bei Raumtemperatur, 700°C und 800°C konnte gezeigt werden, dass die Ti-43Al-4Nb-1 Mo-0,1B-Legierung höhere Festigkeiten und plastische Dehnungen aufweist als herkömmliche hoch Nb-haltige Legierungen.

Abstract

Conventional high Nb bearing γ-TiAl based alloys exhibit relatively strong tendency to segregations because of their peritectic solidification path. This leads to local inhomogeneities of the microstructure which is combined by non-reproducible mechanical properties. The β-solidified Ti-43Al-4Nb-1Mo-0.1B alloy (composition in atomic percent) shows a more homogeneous and fine microstructure in the cast and extruded state. With several heat treatments different modifications of the microstructure were adjusted and a reduction of the mean grain size was achieved. In tensile tests at room temperature, 700°C and 800°C the alloy Ti-43Al-4Nb-1Mo-0.1B shows higher strength and elongations than conventional high Nb containing titanium aluminides.

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Authors and Affiliations

  1. Dept. Metallkunde und Werkstoffprüfung, Montanuniversität Leoben, Franz-Josef-Straße 18, 8700, Leoben, Österreich

    H. F. Chladil & H. Clemens

  2. GfE Gesellschaft für Elektrometallurgie mbH, Höfener Straße 45, 90431, Nürnberg, Deutschland

    A. Otto & V. Güther

  3. Böhler Schmiedetechnik GmbH & Co KG, Mariazeller Straße 25, 8605, Kapfenberg, Österreich

    S. Kremmer

  4. Werkstoffphysik und- technologie, Technische Universität Hamburg-Harburg, Eißendorfer Straße 42, 21073, Hamburg, Deutschland

    A. Bartels

  5. Institut für Werkstoffforschung, GKSS-Forschungszentrum Geesthacht GmbH, Max-Planck-Straße 1, 21502, Geesthacht, Deutschland

    R. Gerling

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  1. H. F. Chladil
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  2. H. Clemens
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  3. A. Otto
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  7. R. Gerling
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Chladil, H.F., Clemens, H., Otto, A. et al. Charakterisierung einer β-erstarrenden γ-TiAl-Basislegierung. Berg Huettenmaenn Monatsh 151, 356–361 (2006). https://doi.org/10.1007/BF03165196

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