STP725

    Reduction of Irradiation-Induced Creep and Swelling in AISI 316 by Compositional Modifications

    Published: Jan 1981


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    Abstract

    Studies involving high fluence irradiations of compositionally modified AISI 316 stainless steel have demonstrated that the irradiation-induced creep and swelling of this alloy can be modified through a selective choice of alloying elements. Irradiation-induced swelling of specimens irradiated to fluences of 7 to 12 × 1022 neutrons/cm2 (E > 0.1 MeV) is strongly influenced by the concentration of alpha-stabilizing elements such as silicon and molybdenum. Relative minima and maxima in swelling versus composition diagrams are shown to exist. Irradiation-induced creep strain of AISI 316 is, in general, reduced by the same elements which reduce irradiation-induced swelling. It was found that the compositional dependence of both swelling and creep in this alloy system can be described through a description of the screening of dislocation strain fields. Compositional modifications which increase the mobility of the screening agents or allow the formation of more effective screening agents will decrease the swelling and irradiation creep. This screening results in a decrease in the interstitial-dislocation bias, which results in lower swelling and in-reactor creep.

    Keywords:

    radiation, irradiation, stainless steels, swelling, in-reactor creep, creep, alloy modifications, bias factor, carbon


    Author Information:

    Bates, JF
    Senior research engineer, manager, Physical Metallurgy Section, and senior scientist, Irradiation Creep Section, Hanford Engineering Development Laboratory, Richland, Wash.

    Powell, RW
    Senior research engineer, manager, Physical Metallurgy Section, and senior scientist, Irradiation Creep Section, Hanford Engineering Development Laboratory, Richland, Wash.

    Gilbert, ER
    Senior research engineer, manager, Physical Metallurgy Section, and senior scientist, Irradiation Creep Section, Hanford Engineering Development Laboratory, Richland, Wash.


    Paper ID: STP28246S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP28246S


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