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.


    Access

    Access via TIB

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Grain boundary engineering of superalloys for aerospace engine applications


    Contributors:


    Publication date :

    2008


    Size :

    6 Seiten, 6 Quellen



    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Grain boundary engineering of Allvac 718Plus for aerospace engine applications

    Lin, Peter / Provenzano, Virgil / Palumbo, Gino et al. | Tema Archive | 2010


    Superalloys for aerospace by powder metallurgy

    Tracey, V.A. | Tema Archive | 1981


    Stress Accelerated Grain Boundary Oxygen Embrittlement on Creep Crack Growth of Nickel-Base Superalloys

    Kang, B. S.-J. / Zhang, G. / Liu, P. et al. | British Library Online Contents | 1995


    Machinability of Elongated Coarse Grain Fe-Based Superalloys

    Özçatalbaş, Yusuf | British Library Online Contents | 2014