STP725

    Microstructural Development in Dual-Ion-Bombarded 316 Stainless Steel

    Published: Jan 1981


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    Abstract

    Specimens of 20 percent cold-worked (CW) and solution-annealed (SA) 316 stainless steel were either dually bombarded with ≤ 2 MeV helium and 28 MeV Si+6 or hot preinjected with helium and subsequently bombarded with 28 MeV Si+6 in the temperature range 550 to 750°C (1022 to 1382°F). Microstructural evaluation by transmission electron microscopy revealed that, although cavity number density and average size are dependent upon the bombardment mode, total swelling is not. Peak swelling was observed at 600 and 650°C (1112 and 1202°F) for SA and CW material, respectively, with changes in swelling being linked primarily to changes in cavity size. Cavity nucleation is often associated with the formation of acicular precipitates, which are a nonequilibrium phase induced by irradiation. Dislocation imaging revealed faulting of loops in SA material, but not CW, with fewer loops present in hot preinjected specimens relative to those bombarded simultaneously. These two microstructural differences may be linked to changes in stacking fault energy due to solute segregation and the effect of helium on loop mobility, respectively.

    Keywords:

    stainless steel, bombardment, accelerators, ion, helium, coimplantation, cavities, damage, microstructure, irradiation, reactors, fusion


    Author Information:

    Wood, S
    Manager, Reactor Materials Research, fellow engineer, consulting scientist, and engineering specialist, Westinghouse Research and Development Center, Pittsburgh, Pa.

    Spitznagel, JA
    Manager, Reactor Materials Research, fellow engineer, consulting scientist, and engineering specialist, Westinghouse Research and Development Center, Pittsburgh, Pa.

    Choyke, WJ
    Manager, Reactor Materials Research, fellow engineer, consulting scientist, and engineering specialist, Westinghouse Research and Development Center, Pittsburgh, Pa.

    Doyle, NJ
    Manager, Reactor Materials Research, fellow engineer, consulting scientist, and engineering specialist, Westinghouse Research and Development Center, Pittsburgh, Pa.

    McGruer, JN
    Professors, University of Pittsburgh, Pittsburgh, Pa.

    Townsend, JR
    Professors, University of Pittsburgh, Pittsburgh, Pa.


    Paper ID: STP28229S

    Committee/Subcommittee: E10.02

    DOI: 10.1520/STP28229S


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