Decomposition of primary MC carbide and its effects on the fracture behaviors of a cast Ni-base superalloy

X. Z. Qin, J. T. Guo, C. Yuan, C. L. Chen, J. S. Hou, H. Q. Ye

    Research output: Contribution to journalArticlepeer-review

    100 Citations (Scopus)


    Primary MC degeneration in long-term thermally exposed cast Ni-base superalloy K452 was investigated in detail. It is shown that the primary MC degeneration is a diffusion-controlled process where various transformation products are sequentially present within the reaction region during exposure. The primary MC degeneration produces a DM or SM microstructure on the MC/γ interface at the initiation of exposure, which hinders the diffusion of alloying elements via its ordered γ′ layers and leads to the presence of the η and α-(W, Mo) phases, respectively during the intermediate and late exposure. In addition, the primary MC deterioration is examined to be detrimental to the long-term thermally exposed alloy due to its contribution to the cracking incidence especially when the MC is present at the grain boundaries.

    Original languageEnglish
    Pages (from-to)74-79
    Number of pages6
    JournalMaterials Science and Engineering A
    Issue number1-2
    Publication statusPublished - 2008 Jun 25


    • Carbides
    • Fracture property
    • MC decomposition
    • Ni-base superalloy
    • Thermal exposure

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering


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