STP956

    Tensile and Fracture Properties of EBR-II-Irradiated V-15Cr-5Ti Containing Helium

    Published: Jan 1987


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    Abstract

    The alloy V-15Cr-5Ti was cyclotron-implanted with 80 appm He and subsequently irradiated in the Experimental Breeder Reactor (EBR-II) to 30 displacements per atom (dpa). The same alloy was also irradiated in the 10, 20, and 30% cold-worked conditions. Irradiation temperatures ranged from 400 to 700°C. No significant effects of helium on mechanical properties were found in this temperature range although the neutron irradiation shifted the temperature of transition from cleavage to ductile fracture to about 625°C. Ten percent cold work was found to have a beneficial effect in reducing the tendency for cleavage fracture following irradiation, but high levels (20%) were observed to reduce ductility. Still higher levels (30%) improved ductility by inducing recovery during the elevated-temperature irradiation. Swelling was found to be negligible, but precipitates—titanium oxides or carbonitrides—contained substantial cavities.

    Keywords:

    vanadium, helium, ductility, swelling, microstructure, fracture, tensile properties, embrittlement, irradiation


    Author Information:

    Grossbeck, ML
    Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN

    Horak, JA
    Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN


    Paper ID: STP25657S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP25657S


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