STP570

    Swelling and Irradiation Induced Microstructural Changes in Nickel-Based Alloys

    Published: Jan 1975


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    Abstract

    Three nickel alloys, Inconel X750, Inconel 600, and Inconel 625, and a 20 percent cold-worked Type 316 stainless steel were bombarded with 5-MeV nickel ions at 650°C (1202°F) to damage levels up to 90 displacements per atom. Post bombardment examination was carried out using 1-MeV transmission electron microscopy to image the entire range of ion damage. The evolution of the microstructure as a function of depth and displacement damage was determined by stereo microscopy. Despite variations in base composition and initial microstructure the three nickel alloys behaved in a similar fashion and exhibited an order of magnitude less swelling than the Type 316 stainless steel. In Inconel X750 containing a dispersion of γ′, loss of coherency of the γ′ particles occurred at very low doses at 550, 600, and 650°C (1022, 1112, and 1202°F). At 600 and 650°C the irradiation induced loop structure was controlled by the initial distribution of γ′, and further precipitation of fine γ′ occurred in the rest of the matrix.

    Keywords:

    radiation, irradiation, nickel alloys, stainless steels, ion beams, ion irradiation, electron microscopy, voids, radiation effects, precipitation


    Author Information:

    Rowcliffe, AF
    Oak Ridge National Laboratory, Oak Ridge, Tenn.

    Diamond, S
    Madison, Pa.

    Bleiberg, ML
    Madison, Pa.

    Spitznagel, J
    Westinghouse Research Laboratories, Pittsburgh, Pa.

    Choyke, J
    Westinghouse Research Laboratories, Pittsburgh, Pa.


    Paper ID: STP33715S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP33715S


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