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Spot Segregation in Alloy IN718

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Abstract

The detection of freckles in high-quality alloys is usually regarded as a reason for rejection since they are known to reduce the mechanical properties of the material. The mechanism proposed for the formation of the freckle type found in Nb-containing superalloys (“downward freckles”) is found to permit the formation of spots of segregation. The spots contain an elevated concentration of Nb but not to the extent found in fully-developed freckles. This work presents a study of the spot segregates found in IN718 vacuum-arc remelted material with respect to the micro-structure and mechanical properties. We conclude on the basis of the results that the spot segregates in IN718 do not contain Laves phase and so do not present a deterioration of the mechanical properties which were tested.

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Acknowledgments

The authors would like to thank MM. A. Chabrier (Aubert & Duval), Y. Le Barzic (Aubert & Duval), M. Garrigue (Aubert & Duval), S. Clouté (Safran Helicopter Engines), O. Berteaux (Safran Helicopter Engines), Philippe Belaygue (Safran Helicopter Engines) and A. Organista (Safran Helicopter Engines) for assistance and comments for this work.

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

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Authors and Affiliations

  1. Aubert Duval, 63770, Les Ancizes, France

    S. Hans

  2. Safran Helicopter Engines, 64511, Bordes, France

    J.-M. Ruppert

  3. Department of Materials Engineering, University of British Columbia, Vancouver, BC, V6T1Z4, Canada

    A. Mitchell

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  1. S. Hans
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Hans, S., Ruppert, JM. & Mitchell, A. Spot Segregation in Alloy IN718. Metall Mater Trans A 54, 3199–3210 (2023). https://doi.org/10.1007/s11661-023-07088-8

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