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    STP570

    Improvement of Creep Properties in a Helium Injected Austenitic Stainless Steel

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    Abstract

    The effect of helium on creep properties was studied in AISI Type 316 austenitic steels after two kinds of treatment, namely, cold rolling and grain-boundary strengthening. Helium was injected into the specimens using a cyclotron, and the creep-rupture tests were performed at 650°C in air. In the cold-rolled specimens, the creep-rupture strengths increased with cold working. The loss of ductility due to the helium injection was minimum at about 10 percent of cold rolling.

    In the grain-boundary strengthened treatment, serrated grain boundaries were produced by the two step solution treatment. The specimens with serrated grain boundaries had good creep-rupture strength in both the presence or absence of helium. However, a specimen with extreme grain growth during the two step solution treatment had low creep ductility and severe helium embrittlement. A specimen which had serrated grain boundaries without extreme grain growth had excellent creep properties in both helium uninjected and injected cases.

    Keywords:

    radiation, austenitic stainless steels, helium, embrittlement, creep rupture, strength, cold working, grain boundaries, strengthening


    Author Information:

    Kawasaki, S
    Senior engineer, Fuel Reliability Laboratory 3, research engineer, Fuel Reliability Laboratory 3, and principal engineer, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

    Furuta, T
    Senior engineer, Fuel Reliability Laboratory 3, research engineer, Fuel Reliability Laboratory 3, and principal engineer, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

    Nagasaki, R
    Senior engineer, Fuel Reliability Laboratory 3, research engineer, Fuel Reliability Laboratory 3, and principal engineer, Japan Atomic Energy Research Institute, Tokai-mura, Ibaraki-ken,

    Uematsu, K
    Manager, Fuel and Materials, Power Reactor and Nuclear Fuel Development Corporation, Minato-Ku, Tokyo


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP33689S