Design and characterization of novel precipitation hardenable high Cr Ni-based superalloys

Uffe Bihlet, Kristian Vinter Dahl, Marcel A. J. Somers

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    Abstract

    Among the Ni-based superalloys, Alloy 718 stands apart with the ability to be precipitation hardened after welding, by the slow formation of nano-scale γ’’ (Ni3Nb) particles. This slow formation gives it a very low crack susceptibility, which has made it widely applied since its introduction in the aircraft industry in the 1960’s. Five powder metallurgical Ni-based superalloys containing 35-45 wt % Cr and 4-6 wt % Nb were designed with the aim of maintaining the hardening mechanism found in Alloy 718, while drastically increasing the hot corrosion resistance. The alloys were manufactured and the actual precipitation of γ’’ was verified with TEM. The mechanical properties of the hardened P/M alloys are comparable to those of Alloy 718.
    Original languageEnglish
    JournalProceedings of the Risø International Symposium on Materials Science
    Volume33
    Pages (from-to)201-207
    ISSN0907-0079
    Publication statusPublished - 2012
    Event33rd Risø International Symposium on Materials Science: Nanometals - Status and Perspective - DTU Risø Campus, Roskilde, Denmark
    Duration: 3 Sept 20127 Sept 2012

    Conference

    Conference33rd Risø International Symposium on Materials Science
    LocationDTU Risø Campus
    Country/TerritoryDenmark
    CityRoskilde
    Period03/09/201207/09/2012

    Bibliographical note

    Proceedings of the 33rd Risø International Symposium on Materials Science : Nanometals - Status and Perspective

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