The precipitate phases of electron beam welded joint in GH141/GH907 superalloy dissimilar materials were studied by scanning electron microscopy (SEM), transmission electron microscope (TEM) and energy dispersive spectrometer (EDS). The welded joint contains GH141 heat affected zone, GH907 heat affected zone and weld area. The results indicate that there is no new precipitate phase in the heat affected zones of electron beam welding. Under the current heat treatment process, the precipitate phases of GH141 heat affected zone are square granular γ′ phases which are covered in matrix densely, thick massive MC type carbides with random distribution and the M6C type carbides which are precipitated mostly in the grain boundaries. Precipitate phases of GH907 heat affected zone are needle shaped ε phases covered in matrix densely and block G phases Nb3Ni2Si which are dispersed distribution. Precipitate phases of weld area are different from the two kinds of welding materials. One of them is a new needle shaped phase which has parallel or staggered distribution, and the other one is a tiny square or ellipsoid granular new precipitate phase which is proved to be orthogonal crystal system NbTi4 phase.


    Access

    Download


    Export, share and cite



    Title :

    Precipitate Phases of Electron Beam Welded Joint in Superalloy Dissimilar Materials


    Contributors:
    LIU Jin (author) / ZHAO Zhiyi (author)


    Publication date :

    2018




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Electron Beam Welding of Dissimilar Materials and Image Acquisition

    Guo, Shun / Zhou, Qi / Peng, Yong et al. | Springer Verlag | 2014


    Electron Beam Welding of Dissimilar Materials and Image Acquisition

    Guo, S. / Zhou, Q. / Peng, Y. et al. | British Library Conference Proceedings | 2014



    Precipitate Free Zones along Recrystallization Grain Boundaries during Creep in a Directionally Solidified Superalloy

    Wang, L. / Xie, G. / Zhang, J. et al. | British Library Conference Proceedings | 2007


    Electron beam welded pistons from France

    AE France,FR | Automotive engineering | 1978