Additive manufacturing provides a new way to develop high-performance superalloys and components. A γ′- strengthened CoNi-base superalloy suitable for additive manufacturing was developed,and a crack-free block material was prepared by optimizing the parameters of electron beam melting(EBM) technology. The experimental results show that the lowest porosity of the alloy is about 0.14% when the scanning speed is 2000 mm/s. The microstructures of the as-printed CoNi-base alloy are columnar grains growing along the <001> direction,the average grain width is about 235 μm,and the volume fraction of γ′ phase is about 30%. After hot isostatic pressing and solution aging treatment,the porosity of the alloy is further reduced to about 0.09% with unobvious change of columnar grains. The average size of γ′ phases is about (70±18)nm with the volume fraction of about (32±3.6)%. The results of room temperature tensile tests show that the additive manufactured γʹ-strengthened CoNi-base superalloy exhibits excellent strength and ductility,showing a good potential of industrial application.


    Access

    Download


    Export, share and cite



    Title :

    Microstructures and mechanical properties of AMed CoNi-base superalloy based on EBM


    Contributors:
    LI Longfei (author) / YU Yao (author) / YAN Chunlei (author) / FENG Qiang (author)


    Publication date :

    2024




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Nickel-base superalloy

    Emerald Group Publishing | 1998


    Wrought nickel-base superalloy

    Miner, R. V. / Harf, F. H. / Kent, W. B. | NTRS | 1978


    MICRO-MECHANICAL MODEL OF A SINGLE CRYSTAL NICKEL-BASE SUPERALLOY

    Tinga, T. / Geers, M. G. D. / Brekelmans, W. A. M. et al. | British Library Conference Proceedings | 2006



    A Data-Driven Bayesian Model for Fatigue in Ni-based Superalloy Microstructures

    Ghosh, Somnath / Weber, George / Pinz, Maxwell | TIBKAT | 2023