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Primary creep: Secondary gamma prime and the rhenium effect

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Abstract

Creep at low temperatures and high stresses in some second-generation nickel-based superalloys can result in large primary creep strains exceeding 5% in fewer than 5 hours. Several possibilities have been given for the appearance of large primary creep strains including the presence of secondary γ′ and the addition of rhenium to these alloys. In light of the recent surge in cost of rhenium, this article explores secondary γ′ and the rhenium effect in the first-and second-generation alloys PWA 1480 and PWA 1484, respectively. In addition, it will be shown that selecting higher aging temperatures can aid in the reduction of primary creep strains in PWA 1484.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Florida, 116 Rhines Hall, Gainesville, Florida, 32611, USA

    Brandon Wilson & Gerhard Fuchs

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  1. Brandon Wilson
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  2. Gerhard Fuchs
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Correspondence to Gerhard Fuchs.

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Wilson, B., Fuchs, G. Primary creep: Secondary gamma prime and the rhenium effect. JOM 60, 43–48 (2008). https://doi.org/10.1007/s11837-008-0088-x

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  • DOI: https://doi.org/10.1007/s11837-008-0088-x

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