Published: Jan 1990
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Tensile specimens of V-15Cr-5Ti, Vanstar-7, V-3Ti-lSi, and V-20TJ were irradiated at 420°C in FFTF-MOTA to a damage level of 82 dpa. Helium was preimplanted to levels up to 480 appm in selected specimens using a modified tritium trick. Irradiation hardeningwas the dominant effect influencing the post irradiation tensile properties, and it markedly increased the yield strength and reduced the total elongation. The V-15Cr-5Ti alloy was very sensitive to helium embrittlement, but Vanstar-7 and V-3Ti-lSi were only slightly affected. Without helium, negligible swelling was found in V-15Cr-5Ti and Vanstar-7, and only small values of swelling (<1%) were measured in V-3Ti-lSi and V-20Ti. Preimplanted helium increased swelling in V-3Ti-lSi by increasing cavity nucleation.
vanadium alloys, neutron irradiation, irradiation hardening, helium embrittlement, low activation alloy, void swelling
Research metallurgist, Oak Ridge National Laboratory, Oak Ridge, TN