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    STP1047

    Optimization of Reduced Activation Ferritic Steels

    Published: 01 January 1990


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    Abstract

    In order to develop potential reduced-activation ferritic steels for fusion reactor structures, phase stability, toughness and creep rupture strength were investigated for Cr-W and Cr-V steels. Primary concern focused on 9% chromium steels because of their superior high temperature strength compared to low chromium steels. The Cr-W steels exhibited a similar precipitation behavior to carbides and intermetallic compound with conventional Cr-Mo steels while the Cr-V steels exhibited a quite different behavior. Creep rupture strength of 9Cr-2 steels increased but their toughness decreased with increasing the tungsten concentration. A martensitic 9Cr-lW steel showed an excellent toughness. On the other hand, both toughness and creep rupture strength of 9Cr-V steels were poor. The minor additions of vanadium, tantalum, and boron to the 9Cr-lW steel significantly increase creep rupture strength without the degradation of its excellent toughness.

    Keywords:

    ferritic steels, reduced activation, phase stability, bainite, martensite, δ-ferrite, carbides, intermetallic compound, toughness, ductile-brittle transition temperature (DBTT), creep rupture strength


    Author Information:

    Abe, F
    Senior researcher, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,

    Noda, T
    Head of the second laboratory, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,

    Araki, H
    Research assistant, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,

    Okada, M
    Director, Tsukuba Laboratories, National Research Institute for Metals, Tsukuba,


    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP24954S