STP529

    Studies of Void Formation in Proton-Irradiated Type 316 and Titanium-Modified 316 Stainless Steels

    Published: Jan 1973


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    Abstract

    Void formation was studied in annealed Type 316 stainless steel irradiated with 1-MeV protons at 400 C, 500 C, and 600 C (752, 932, and 1112 F) for amounts of damage up to 50 displacements per atom (dpa). Prior to irradiation, the samples were injected with about 5 atomic ppm helium to simulate the fast-reactor situation, where helium is generated by (n,α) reactions. The volume increase at each temperature, as determined by quantitative electron microscopy, varied exponentially with displacement damage and the exponent increased with temperature. Volume increases exceeding 20 percent were associated with 50 dpa at 500 C and 20 dpa at 600 C; no limits on volume increases were apparent at any temperature. Void number density decreased and average void size increased with increasing temperature for a constant damage. A titanium-modified 316 stainless steel developed a very inhomogeneous void distribution when proton irradiated at 600 C. However, the addition of titanium did not appear to diminish the volume increase at damages between 5 and 10 dpa, when compared with ordinary Type 316 stainless steel.

    Keywords:

    voids, protons, irradiation, stainless steels, radiation effects, electron microscopy


    Author Information:

    Keefer, DW
    Member of technical staff, member of technical staff, and manager, Physical Metallurgy, Rockwell International Corp., Canoga Park,

    Pard, AG
    Member of technical staff, member of technical staff, and manager, Physical Metallurgy, Rockwell International Corp., Canoga Park,

    Kramer, D
    Member of technical staff, member of technical staff, and manager, Physical Metallurgy, Rockwell International Corp., Canoga Park,


    Paper ID: STP35451S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP35451S


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