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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

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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.

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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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Authors and Affiliations

  1. Aerospace Manufacturing Technology Center, Institute for Aerospace Research, National Research Council Canada, 5145 Decelles Avenue, Montreal, QC, H3T 2B2, Canada

    X. Cao, B. Rivaux & M. Jahazi

  2. Ecole des Mines de Paris, CEMEF – Materials Processing Center, Rue Claude Daunesse, BP 207, 06904, Sophia-Antipolis Cedex, France

    B. Rivaux

  3. Standard Aero Limited, 33 Allen Dyne Road, Winnipeg, MB, R3H 1A1, Canada

    J. Cuddy & A. Birur

Authors
  1. X. Cao
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  2. B. Rivaux
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  3. M. Jahazi
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  4. J. Cuddy
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  5. A. Birur
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Corresponding author

Correspondence to X. Cao.

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Cao, X., Rivaux, B., Jahazi, M. et al. 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. J Mater Sci 44, 4557–4571 (2009). https://doi.org/10.1007/s10853-009-3691-5

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  • DOI: https://doi.org/10.1007/s10853-009-3691-5

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