Micro-and macro-creep damage formation for p92 under multiaxial stress related to circular notched specimen

H. Shigeyama, R. Sugiura, T. Matsuzaki, A. T. Yokobori

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    In this study, to clarify the behaviour of micro- and macro-creep damage progression for P92 under multiaxial stress field, interrupted creep tests, analysis of multiaxial stress and detailed the cross-sectional observations were conducted on a circular notched round bar specimen which produces the multiaxial stress field due to the plastic constraint. As a result, creep voids were initiated at the early stage and they were formed up to the final fracture. These phenomena were found to be detected using direct current potential drop (DCPD) method. These results concern the development of the measurement of creep crack initiation. The distribution of high void area fraction was in good agreement with that of high hydrostatic stress and high multiaxial stress. This result indicates that multiaxial stress affects the void formation. Furthermore, the micro-creep damage of each interrupted specimen was evaluated by using the electron backscatter diffraction (EBSD) method which can analyse crystallographic misorientation caused by creep strain. The results of EBSD analyses indicated that the value of grain reference orientation deviation (GROD) closely concerns the void initiation.

    Original languageEnglish
    Pages (from-to)43-49
    Number of pages7
    JournalEnergy Materials: Materials Science and Engineering for Energy Systems
    Volume9
    Issue number2
    DOIs
    Publication statusPublished - 2014

    Keywords

    • Circular notched round bar specimen
    • Creep crack initiation
    • Creep damage
    • EBSD
    • Interrupted test
    • Multiaxial stress
    • P92
    • Void area fraction

    ASJC Scopus subject areas

    • Renewable Energy, Sustainability and the Environment
    • Energy Engineering and Power Technology

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