STP782

    Ion Damage in 316 Stainless Steel Over a Broad Dose Range

    Published: Jan 1982


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    Abstract

    Microstructural evolution was examined in annealed 316 stainless steel after heavy-ion bombardment in the range 1 to 256 dpa at 900 K with simultaneously implanted helium at a rate of 10 appm/dpa and deuterium at a rate of 25 appm/dpa. Phase decomposition was rather limited compared with that in neutron irradiations; only an unidentified plate-like precipitate at low dose, and blocky M2 3C6 particles on grain boundaries were formed. Swelling from cavity formation increased with dose to about 20% at about 200 dpa above which it appeared to saturate. Cavity concentrations saturated at about 100 dpa, and dislocations much earlier. The matrix cavities included a persistant complement of ∼7-nm diam small cavities. Similar-size helium bubbles were prolific on the grain boundaries.

    Keywords:

    austenitic 316 steel, heavy-ion irradiation, high dose, swelling, helium effects, phase stability, helium bubbles


    Author Information:

    Packan, NH
    Oak Ridge National Laboratory, Oak Ridge, TN

    Farrell, K
    Oak Ridge National Laboratory, Oak Ridge, TN


    Paper ID: STP34385S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP34385S


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