Investigation of In Situ and Conventional Post-Weld Heat Treatments on Dual-Laser-Beam-Welded γ-TiAl-Based Alloy

Authors

  • Jie Liu,

    Corresponding author
    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics Max-Planck-Straße 1, 21502 Geesthacht, Germany
    • Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • Volker Ventzke,

    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • Peter Staron,

    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Physics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • Norbert Schell,

    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Physics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • Nikolai Kashaev,

    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • Norbert Huber

    1. Helmholtz-Zentrum Geesthacht, Institute of Materials Research, Materials Mechanics Max-Planck-Straße 1, 21502 Geesthacht, Germany
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  • The authors acknowledge Dr. Michael Oehring and Prof. Dr. Florian Pyczak for providing the γ-TiAl extruded material.

Abstract

This paper describes a way to improve the microstructure and mechanical properties of welding seams by in situ and conventional post-weld heat treatments for laser beam welding of the Ti–45Al–5Nb–0.2C–0.2B alloy. The seams are crack-free with reduced longitudinal residual stress and higher elongation to fraction after post-weld heat treatment. The welding zone consists of α2 after welding, transforms to a massive γ during in situ post-weld heat treatment, and finally forms a convoluted microstructure after conventional heating. The phase composition across the welding zone is discussed.

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