The large-sized (?300 mm) nickel based superalloy GH738 billet was fabricated by spray forming followed by hot isostatic press (HIP) and hot extrusion (HEX) within varied deformation temperatures. The micro-defect, carbonitride distribution, γ/γ′ evolution during the hot processes were investigated by the relevant approaches including XRD, SEM, TEM, EBSD and phase analysis technique respectively. The results show that the porosities in γ matrix of spray deposited billet are welded up to closure after HIP process. The difference of characteristic microstructure after dynamic recrystallization obtained after the hot extrusion is mainly based on the varied deformation conditions including temperature and strain-stress state. The grain-boundary-distributed carbonitrides in HIPed billiet are transformed into extrusion-direction-along distribution after hot extrusion. The effects of temperature field delivered and cooling condition on elements constitution, mass fraction, morphology, size and distribution of γ′ in GH738 are validated during different hot processes as well.


    Zugriff

    Download


    Exportieren, teilen und zitieren



    Titel :

    Effect of hot isostatic press and hot extrusion on microstructure of spray formed GH738 alloy


    Beteiligte:
    WANG Yue (Autor:in) / XU Wenyong (Autor:in) / LIU Na (Autor:in) / YUAN Hua (Autor:in) / ZHENG Liang (Autor:in) / LI Zhou (Autor:in) / ZHANG Guoqing (Autor:in)


    Erscheinungsdatum :

    2019




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Unbekannt







    Spray formed aluminium alloy components for automotive applications

    Sano, H. / Tokizane, N. / Ohkubo, Y. et al. | Tema Archiv | 1993


    Spray-formed tooling

    McHugh,K.M. / Key,J.F. / Idaho National Engng.Lab.,US | Kraftfahrwesen | 1995