Effects of alloying additions and material microstructure on the accuracy of the predictive law of creep crack growth for W-strengthened 9-12% Cr ferritic heat-resistant steel

Ryuji Sugiura, A. Toshimitsu Yokobori, Shinjyu Takamori, Masaaki Tabuchi, Akio Fuji, Mitsuo Yoda, Kenichi Kobayashi, Takeo Yokobori

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    The life of creep crack growth for W-strengthened 9-12%Cr steel is sensitive to the alloying additions and to differences in material microstructure, such as lath martensitic structure and grain size caused by differences in cooling rates in the steel ingots during the manufacturing process, which results in the large scatter of experimental data from the law of creep crack growth life. In the present study, creep crack growth tests were conducted using W-strengthened 9-12%Cr steels with various contents of alloying additions and the dimensions of micro-nano structures, The effects of the composition of alloying additions and material microstructures on the life of creep crack growth for W-strengthened 9-12%Cr steel were clarified.

    Original languageEnglish
    Pages (from-to)2928-2936
    Number of pages9
    JournalMaterials Transactions
    Volume48
    Issue number11
    DOIs
    Publication statusPublished - 2007 Nov

    Keywords

    • Crack growth
    • Creep
    • Grain size
    • Lath martensitic structure
    • Molybdenum equivalence (molybdenum% + 1/2tungsten%)
    • Tungsten strengthened 9-12%chromium ferritic heat-resistant steel

    ASJC Scopus subject areas

    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanics of Materials
    • Mechanical Engineering

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