Investigation on Long-term Creep Rupture Properties and Microstructure Stability of Fe-Ni based Alloy Ni-23Cr-7W at 700°C

Tsuyoshi Tokairin, Kristian Vinter Dahl, Hilmar Kjartansson Danielsen, Flemming Bjerg Grumsen, John Hald, Takashi Sato

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Long-term creep rupture properties and microstructural stability of Fe–Ni based alloy Ni–23Cr–7W (HR6W, ASME Code Case 2684) were experimentally investigated. Crept specimens at 700 °C for durations up to 37,667 h were chosen, the microstructure evolution during creep was characterized. Besides the MC and M23C6 carbides found in the as-received sample, the formation of α-W phase, α-Cr phase and Laves phase in crept samples were confirmed with scanning/transmission electron microscopes. Statistical quantitative image analysis was used to evaluate the precipitation behavior and growth kinetics for the main strengthening precipitate, Laves phase. The alloy was proven to have good microstructural stability without observable coarsening of strengthening precipitates during long-term creep up to around 37,667 h. It was also verified that the growth kinetics of Laves phase can be well described by the Johnson–Mehl–Avrami–Kolmogorov equation.
    Original languageEnglish
    JournalMaterials Science & Engineering: A
    Volume565
    Pages (from-to)285-291
    ISSN0921-5093
    DOIs
    Publication statusPublished - 2013

    Keywords

    • Long-term creep
    • Microstructural evolution
    • Microstructure stability
    • Fe–Ni basedalloy
    • HR6W

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