Estimation of creep fracture life for Hastelloy XR by Q* parameter

Yoshiyuki Kaji, Kenji Kikuchi, Toshimitsu Yokobori

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)


    A Q* parameter was applied to an estimation of the creep crack growth rate for Hastelloy XR under creep conditions at very high temperatures. Creep fracture times were evaluated and examined with the parameter derived by integrating the creep crack growth rate formula expressed in terms of the Q* parameter for notched and smooth specimens. The Q* parameter could characterize creep crack growth rate successfully including the early stage of crack propagation. It is shown that the parameter (T(log10 tf + 20) × 10-3) derived from the Q* parameter can compare and estimate the difference in geometry of specimen, ductility of material and so on, using the identical parameter and this parameter is of engineering value.

    Original languageEnglish
    Pages (from-to)519-528
    Number of pages10
    JournalEngineering Fracture Mechanics
    Issue number4
    Publication statusPublished - 1995 Jan 1

    ASJC Scopus subject areas

    • Materials Science(all)
    • Mechanics of Materials
    • Mechanical Engineering


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