Evaluation of damage and fracture of high Crasteel welds at elevated temperatures

M. Tabuchi, H. Hongo, Ryuji Sugiura, A. T. Yokobori, M. Yatomi, K. Kobayashi

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    High Cr ferritic steels have been used in the 600°C class ultra-super critical (USC) thermal power plants. More than a decade has passed from the application of high Cr steels to USC power plants in Japan, and type-IV creep damages in the welded components become concerns. In the present paper, long-term creep tests for the welded joints of the high Cr steels (Gr.91 and Gr.122 steels) were conducted. Microstructures and creep damages in the heat affected zone (HAZ) were investigated using the thick plate specimens. Remaining life assessment methods of high Cr steel welds were discussed based on the experimental results. Further, to assist the standardization of the testing method for creep crack growth in welded joints, we have conducted the round robin tests using the high Cr steels (Gr.91 and Gr.92 steels) and their welds as part of the VAMAS TWA31 collaboration.

    Original languageEnglish
    Pages (from-to)31-41
    Number of pages11
    JournalStrength, Fracture and Complexity
    Volume9
    Issue number1
    DOIs
    Publication statusPublished - 2015 May 20

    Keywords

    • High Cr ferritic steel
    • creep
    • creep crack growth
    • type-IV damage
    • welded joint

    ASJC Scopus subject areas

    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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