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Journal of Materials Science

, Volume 44, Issue 17, pp 4557–4571 | Cite as

Effect of pre- and post-weld heat treatment on metallurgical and tensile properties of Inconel 718 alloy butt joints welded using 4 kW Nd:YAG laser

  • X. CaoEmail author
  • B. Rivaux
  • M. Jahazi
  • J. Cuddy
  • A. Birur
Article

Abstract

The effects of pre- and post-weld heat treatments on the butt joint quality of 3.18-mm thick Inconel 718 alloy were studied using a 4 kW continuous wave Nd:YAG laser system and 0.89-mm filler wire with the composition of the parent metal. Two pre-weld conditions, i.e., solution treated, or solution treated and aged, were investigated. The welds were then characterized in the as-welded condition and after two post-weld heat treatments: (i) aged, or (ii) solution treated and aged. The welding quality was evaluated in terms of joint geometries, defects, microstructure, hardness, and tensile properties. HAZ liquation cracking is frequently observed in the laser welded Inconel 718 alloy. Inconel 718 alloy can be welded in pre-weld solution treated, or solution treated and aged conditions using high power Nd:YAG laser. Post-weld aging treatment is enough to strengthen the welds and thus post-weld solution treatment is not necessary for strength recovery.

Keywords

Welding Fusion Zone Lave Phase Joint Efficiency Solution Treated Condition 

Notes

Acknowledgements

This report is part of the collaborative research Project between IAR-AMTC and SAL (46M3-J017). Thanks are due to E. Poirier and M. Banu, Technical Officers, for the preparation of weld joints, technical support to welding metallurgy, and tensile testing.

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Copyright information

© GovernmentEmployee: Crown copyright from National Research Council Canada 2009

Authors and Affiliations

  • X. Cao
    • 1
    Email author
  • B. Rivaux
    • 1
    • 2
  • M. Jahazi
    • 1
  • J. Cuddy
    • 3
  • A. Birur
    • 3
  1. 1.Aerospace Manufacturing Technology CenterInstitute for Aerospace Research, National Research Council CanadaMontrealCanada
  2. 2.Ecole des Mines de ParisCEMEF – Materials Processing CenterSophia-Antipolis CedexFrance
  3. 3.Standard Aero LimitedWinnipegCanada

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