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    Irradiation and Thermal Effects on the Tensile Properties of Inconel-718


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    The effects of neutron irradiation and out-of-flux aging on the tensile properties of wrought and weld-deposited Inconel-718 have been investigated following fast-reactor irradiation to total fluences ranging from 0.55 × 1022 neutrons (n)/cm2 (∼400°C) (752°F) to 6.6 × 1022 n/cm2 (649°C) (1200°F) and thermal exposure at 538 and 649°C (1000 and 1200°F) for durations to 10 000 h. Classical irradiation hardening is exhibited by this very strong material following irradiation at low temperature (∼400°C) (752°F) to relatively low fluence (∼1022 n/cm2) and also at high temperature when very high fluence (6.6 × 1022 n/cm2) is accumulated. At test temperatures ≥538°C (1000°F), ductility losses arising from helium embrittlement are evident for all irradiation conditions and at high fluences are so severe as to restrict the strength to lower than expected values.

    Low postirradiation strength, compared to that following out-of-flux aging for equivalent durations, suggests that irradiation accelerates the thermal overaging process at 538°C (1000°F). At 649°C (1200°F), the results are obscured by embrittlement and coincident limitations on strain hardenability.


    radiation, irradiation, thermal stability, helium, thermal reactors, tensile properties, nickel alloys, strain hardening

    Author Information:

    Ward, AL
    Senior engineer, advanced engineer, and manager,

    Steichen, JM
    Senior engineer, advanced engineer, and manager,

    Knecht, RL
    Senior engineer, advanced engineer, and manager,

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38046S