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Inertia Friction Welding Dissimilar Nickel-Based Superalloys Alloy 720Li to IN718

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Abstract

This article describes a comprehensive microstructural characterization of an inertia friction welded joint between nickel-based superalloys 720Li and IN718. The investigation has been carried out on both as-welded and postweld heat-treated conditions. The detailed metallographic analysis has enabled the relation of hardness profiles across inertia-welded alloy 720Li to IN718 and morphological changes of the precipitates present. The work demonstrates that inertia friction welding (IFW) 720Li to IN718 results in a weld free of micropores and microcracks and no significant chemical migration across the weld line. However, substantial differences in terms of grain structure and precipitation phase distribution variations are observed on each side of the dissimilar weld. The high γ′ volume fraction alloy 720Li exhibits a wider heat-affected zone than the mainly γ′′ strengthened IN718. Alloy 720Li displays only a small hardness trough near the weld line in the as-welded condition due to the depletion of γ′, while γ″-strengthened IN718 shows a soft precipitation-free weld region. Postweld heat treatment (PWHT) of the dissimilar weld at 760 °C, a typical annealing temperature for alloy 720Li, results in an overmatch of the heat-affected zone in both sides of the weld. The comparison of the as-welded and postweld heat-treated condition also reveals that IN718 is in an overaged condition after the stress relief treatment.

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Acknowledgments

The authors acknowledge the UK Department of Trade and Industry and Rolls Royce plc. for financial support and Peter Thornton (The University of Birmingham) and Mike Faulkner (University of Manchester) for experimental support.

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Authors and Affiliations

  1. Department of Metallurgy and Materials, School of Engineering, The University of Birmingham, Birmingham, B15 2TT, United Kingdom

    Z.W. Huang (Senior Research Fellow), H.Y. Li (Research Fellow) & P. Bowen (Professor)

  2. School of Materials, University of Manchester, Manchester, M1 7HS, United Kingdom

    M. Preuss (Lecturer in Materials Performance) & M. Karadge (Research Fellow)

  3. Rolls-Royce plc, Elton Road, Derby, DE24 8BJ, United Kingdom

    S. Bray (Friction Welding Sprcialist) & G. Baxter (Intertia Welding Sprcialist)

Authors
  1. Z.W. Huang
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  2. H.Y. Li
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  3. M. Preuss
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  4. M. Karadge
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  5. P. Bowen
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  6. S. Bray
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  7. G. Baxter
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Correspondence to Z.W. Huang.

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Manuscript submitted June 15, 2006.

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Huang, Z., Li, H., Preuss, M. et al. Inertia Friction Welding Dissimilar Nickel-Based Superalloys Alloy 720Li to IN718 . Metall Mater Trans A 38, 1608–1620 (2007). https://doi.org/10.1007/s11661-007-9194-6

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  • DOI: https://doi.org/10.1007/s11661-007-9194-6

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