By means of microstructure observation on Hf-containing K416B Ni-based superalloy with high W-content after solid solution heat treatment at different temperatures, the effect of solid solution temperature on microstructure of the alloy was investigated. The results show that with the increasing of solid solution temperature, the size of secondary dendrite increases slightly by element diffusion, and the eutectic content decreases gradually to promote the densification of alloy microstructure. In addition, the γ′ phase is dissolved into the matrix, and its size is decreased. During high temperature solid solution heat treatment, the primary strip MC phase in the inter-dendrite is decomposed to form granular M6C carbides, while the morphology and quantity of large sized block M6C phase in eutectic have no obvious change. The solid solution treatment causes that the element W is segregated in the dendrites to diffuse into inter-dendrites, and elements of Hf,Nb,Ti and Cr diffuse into the dendrites, the segregation degree of each element of the alloy is greatly reduced. The results of microstructure research indicate that the optimal solid-solution heat treatment process for the alloy is 1220 ℃ × 4 h.


    Access

    Download


    Export, share and cite



    Title :

    Effect of solid solution temperature on microstructure of Hf-containing K416B Ni-based superalloy with high W-content


    Contributors:
    HOU Guichen (author) / SU Haijun (author) / XIE Jun (author) / XUN Shuling (author) / YU Jinjiang (author) / SUN Xiaofeng (author) / ZHOU Yizhou (author)


    Publication date :

    2019




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    Unknown




    Effect of Solid Solution Treatment on Microstructure and Mechanical Properties of DS Superalloy DZ8

    ZHANG Shuaiqi / ZONG Cui / CHEN Shengping et al. | DOAJ | 2016

    Free access

    Effect of C Content on Microstructure of Second Generation Single Crystal Superalloy

    LIU Shizhong / SHI Zhenxue / LI Jiarong | DOAJ | 2017

    Free access


    Effect of Co content on microstructure and stress rupture properties of DD15 single crystal superalloy

    SHI Zhenxue / LIU Shizhong / YUE Xiaodai et al. | DOAJ | 2020

    Free access