Relationship between creep behavior and microstructure in martensitic heat resistant steel

Kengo Iwanaga, Toshihiro Tsuchiyama, Setsuo Takaki

    Research output: Contribution to journalArticlepeer-review

    12 Citations (Scopus)

    Abstract

    Relationship between creep deformation behavior and microstructural change has been investigated in a 12%Cr-0.12%C steel by means of optical and transmission electron microscopy. Applied stress assists the recovery of martensite at high temperature: Dislocation density is markedly decreased and Ostwald growth of M23C6 type carbide is promoted. Creep deformation behavior strongly depends on these microstructural changes in lath martensitic structure. In the early stage of creep test, M23C6 type carbide particles precipitate along lath boundary and form rod-like carbide. Such a carbide effectively suppresses the movement of dislocations and contributes to the holding of creep strength. But once the rod-like carbide is separated through Ostwald growth of carbide particles during creep deformation, dislocations become easy to move and the recovery of martensite proceeds rapidly. This leads to an acceleration of the creep deformation.

    Original languageEnglish
    Pages (from-to)896-901
    Number of pages6
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume84
    Issue number12
    DOIs
    Publication statusPublished - 1998

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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