Grain Boundary Engineering (GBE) involves microstructural optimization via the strategic application of thermo-mechanical metallurgical processing and fabrication steps that increase the fraction of special, low-energy, and degradation-resistant grain boundaries (i.e., structurally ordered low Sigma grain boundaries) in the microstructure. By elevating the fraction of special grain boundaries in a metal or alloy either in the bulk or in the near-surface region, a commensurate improvement in the material properties is achieved owing to the intrinsic degradation-resistance (corrosion, sliding, cracking) of the 'special' grain boundaries. Alloys that can benefit from this treatment include nickel-based superalloys that are used in the hot sections of gas turbine engines. Under increasingly demanding operating conditions, these materials can be vulnerable to grain boundary-related elevated-temperature degradation processes including creep, fatigue, solute segregation, precipitation embrittlement, and intergranular environmental attack. In this study, the benefits of GBE-processing on the reliability and durability of Inconel 718 superalloy are presented and discussed with emphasis on the improvement of its resistance to creep and crack growth.


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    Titel :

    Grain boundary engineering of superalloys for aerospace engine applications


    Beteiligte:
    Lin, Peter (Autor:in) / Provenzano, Virgil (Autor:in) / Heard, Robert (Autor:in) / Miller, Herbert (Autor:in) / Palumbo, Gino (Autor:in) / Vecchio, Kenneth (Autor:in) / Jiang, Fengchun (Autor:in) / Gabb, Tim (Autor:in) / Telesman, Jack (Autor:in)


    Erscheinungsdatum :

    2008


    Format / Umfang :

    6 Seiten, 6 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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