Characterization of incubation time on creep crack growth for weldments of P92

Ryuji Sugiura, Toshimitsu Yokobori, Kazuto Suzuki, Masaaki Tabuchi

    Research output: Contribution to journalArticle

    28 Citations (Scopus)

    Abstract

    Most structures are mainly fabricated by welding which are likely to be regions of crack initiation and propagation. In such weldment, it is known that the multi-axial stress fields appear due to the plastic constraint induced by the differences in material micro-structure between the weld metal, heat affected zone (HAZ) and base metal. In the present study, the experiments of creep crack growth tests and the structural mechanical analyses of weldment were conducted to understand the effects of stress multi-axiality of weldment on the characteristics of creep crack growth, creep deformation and creep ductility. Additionally, to characterize the time of creep crack initiation up to the start of a brittle type creep crack growth, the distribution of stress multi-axiality (TF) through the base metal, fine-grain HAZ, coarse-grain HAZ to weld metal were investigated.

    Original languageEnglish
    Pages (from-to)3053-3065
    Number of pages13
    JournalEngineering Fracture Mechanics
    Volume77
    Issue number15
    DOIs
    Publication statusPublished - 2010 Oct 1

    Keywords

    • Creep crack growth
    • Creep ductility
    • Incubation time
    • Multi-axiality
    • Weldment

    ASJC Scopus subject areas

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

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