STP426

    Effects of Neutron Irradiation on Creep-Rupture Properties of W-25RE Alloy

    Published: Jan 1967


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    Abstract

    The creep-rupture properties of W-25Re alloy irradiated at reactor ambient temperature to fast neutron fluences of 1 to 4 × 1019 neutrons/cm2 (En > 1 Mev) have been determined for test temperatures in the range of 800 to 1100 C. Irradiation tended to decrease the minimum creep rate and increase the time to rupture in this postirradiation test temperature range.

    It is shown that testing irradiated specimens at 1100 C significantly reduced the rupture ductility. The stress dependency of the creep process in the 900 and 1000 C tests of the irradiated and the control specimens was not appreciably changed. A pronounced change in the stress dependency of irradiated specimens tested at 800 C was observed. The effect is interpreted as a significant change in the nature of the irradiation-induced defect configurations which do not dissociate at temperatures below 900 C and on their subsequent interaction with mobile dislocations.

    Transmutation effects which occur in W25-Re irradiated in thermal neutron spectrums are discussed. In particular, the production of osmium atoms and their effect on the flow stress is considered.

    Keywords:

    tungsten alloys, rhenium alloys, radiation effects, nuclear transmutations, creep, stress-rupture, neutron radiation


    Author Information:

    Kingsbury, F. D.
    Nuclear Materials and Propulsion OperationMr. Kingsbury is a personal member, ASTM, General Electric Co., Cincinnati, Ohio

    Moteff, J.
    Nuclear Materials and Propulsion OperationMr. Kingsbury is a personal member, ASTM, General Electric Co., Cincinnati, Ohio


    Paper ID: STP41336S

    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP41336S


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