STP725: Stress-Enhanced Swelling of Metals During Irradiation

    Garner, FA
    Fellow scientist and senior engineer, Hanford Engineering Development Laboratory, Richland, Wash.

    Gilbert, ER
    Fellow scientist and senior engineer, Hanford Engineering Development Laboratory, Richland, Wash.

    Porter, DL
    Senior scientist, EBR-II Project, Argonne National Laboratory, Idaho Falls, Idaho

    Pages: 18    Published: Jan 1981


    Abstract

    Data are now available which definitively show that stress plays a major role in the development of radiation-induced void growth in AISI 316 and many other alloys. Some earlier experiments which came to the opposite conclusion are shown to have investigated stress levels which inadvertently deformed the material. Stress-affected swelling spans the entire temperature range in fast reactor irradiations and accelerates with increasing irradiation temperature. It also appears to operate in all alloy starting conditions investigated. Two major microstructural mechanisms appear to be causing the enhancement of swelling, which for tensile stress is manifested primarily as a decrease in the incubation period. These mechanisms are stress-induced changes in the interstitial capture efficiency of voids and stress-induced changes in the vacancy emission rate of various microstructural components. There also appears to be an enhancement of intermetallic phase formation with applied stress and this is shown to increase swelling by accelerating the microchemical evolution that precedes void growth at high temperature. This latter consideration complicates the extrapolation of these data to compressive stress states.

    Keywords:

    radiation, fast reactors, swelling, voids, dislocations, stress, phase stability, stainless steel


    Paper ID: STP28244S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP28244S


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