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Effect of Laser Welding Parameters on the Microstructure and Mechanical Properties of Dissimilar Hastelloy X/Haynes 188 Joints

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Abstract

Laser welding is currently a versatile and reliable assembly technique. To save weight in aerostructures and propulsion units and to reduce thermal distortions and the heat-affected zones in these assemblies, autogenous laser welding seems promising. This experimental work addresses dissimilar autogenous laser welding of thin alloy sheets using a Yb:YAG source and a particular optical fibre setting. Hastelloy X and Haynes 188 are the two base metals studied for this assembly. An experimental design allows us to determine the weldability domain. The macro- and microstructure and mechanical properties of the weld seams are investigated. EBSD and EDS analysis revealed microstructural and chemical heterogeneities in the high-power welded seam, but XRD results demonstrated a homogeneous depletion of the carbide density in its fusion zone. Despite such microstructural features, the mechanical properties of obtained assemblies were found to be satisfactory and slightly greater than those of the weaker Hastelloy X.

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Acknowledgments

The authors are thankful to EXAMECA for their financial support, in particular for providing the Haynes 188 and Hastelloy X alloys. Furthermore, we wish to thank Cédric Bellot, Director of ACRDM, for giving our team access to the ESRF and Marie-Christine Laffont, CIRIMAT, for TEM observations.

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. LGP, ENIT/INPT, Université de Toulouse, 47 av. d’Azereix, BP1629, 65016, Tarbes cedex, France

    Joël Alexis, Jérémie Graneix & Yannick Balcaen

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  1. Joël Alexis
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  2. Jérémie Graneix
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  3. Yannick Balcaen
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Correspondence to Joël Alexis.

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Manuscript submitted May 10, 2021; accepted August 29, 2021.

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Alexis, J., Graneix, J. & Balcaen, Y. Effect of Laser Welding Parameters on the Microstructure and Mechanical Properties of Dissimilar Hastelloy X/Haynes 188 Joints. Metall Mater Trans A 52, 5055–5065 (2021). https://doi.org/10.1007/s11661-021-06452-w

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