Creep crack initiation and growth characteristics in weldment for P92 based on C*, dδ/dt and Q* parameters

Ryuji Sugiura, A. Toshimitsu Yokobori, Kazuto Sato, Masaaki Tabuchi, Masataka Yatomi, Kenichi Kobayashi, Kamran Nikbin

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Most boiler component structures are mainly fabricated by welding which are likely to be regions of crack initiation and propagation. However, the technique of predicting the life of creep crack initiation and growth have not been clearly developed for weldments of W-added 9%Cr ferritic heat-resistant material (ASME Code Case 2179, ASTM A335 P92) due to many factors such as the variation in micro-structure and the residual stresses caused by welding and thermal cycles. In the present paper, high temperature creep crack growth tests were conducted using C(T) specimens with the cracks in the heat affected zone of weldments for P92. To derive the algorithm of predicting the life of creep crack growth, the creep crack growth rate were estimated by C*, dδ/dt and Q* parameters. Additionally, the definition and estimation method of creep crack initiation and growth life for weldments were discussed on the basis of the concept of structural brittleness.

    Original languageEnglish
    Pages (from-to)177-189
    Number of pages13
    JournalStrength, Fracture and Complexity
    Volume6
    Issue number4
    DOIs
    Publication statusPublished - 2010

    Keywords

    • C parameter
    • P92 steel
    • Qconcept
    • creep crack growth
    • load line displacement rate
    • welded joint

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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