STP870: Evolution of Cavity Microstructure in Ion-Irradiated Type 316 Stainless Steel and Fe-20Ni-15Cr Alloy

    Kohyama, A
    Associate professor and professor, University of Tokyo, Tokyo,

    Loomis, BA
    Senior scientist and scientist, Materials Science and Technology Division, Argonne National Laboratory, Argonne, IL

    Ayrault, G
    Senior scientist and scientist, Materials Science and Technology Division, Argonne National Laboratory, Argonne, IL

    Igata, N
    Associate professor and professor, University of Tokyo, Tokyo,

    Pages: 20    Published: Jan 1985


    Abstract

    The effect of a helium implantation schedule on the evolution of the cavity microstructure in Type 316 stainless steel and Fe-20Ni-15Cr alloy during heavy-ion irradiation was investigated for damage levels up to 100 displacements per atom (dpa) with three helium injection schedules, that is, 15 atomic parts per million (appm) He/dpa, 50 appm He/dpa, and 15 appm He pre-injected prior to Ni+ ion irradiation. In the case of the dual-ion irradiated specimens, there was a trend towards a saturation of the swelling with increasing damage level that was coincident with the saturation and a subsequent decrease of the number density of the small cavities (<8 nm diameter for Type 316 stainless steel and <4 nm for Fe-20Ni-15Cr) and the dislocation density. The bi-modal cavity size distribution that was determined for the Fe-20Ni-15Cr alloy at 40 dpa changed to uni-modal distribution at 65 and 100 dpa.

    Keywords:

    radiation, Type 316 stainless steel, iron-nickel-chromium alloy, microstructural evolution, swelling, dual-ion irradiation, heavy-ion irradiation, helium injection schedule, helium effect, radiation-induced segregation, size distribution of cavities, cavity microstructure


    Paper ID: STP37368S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP37368S


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