STP683

    Fracture Toughness of Irradiated AISI 304 and 316L Stainless Steels

    Published: Jan 1979


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    Abstract

    The fracture toughness of AISI 304 and 316L stainless steels and their welds irradiated to 7 × 1025 neutrons (n)/m2 (50 percent of this was at E > 0.1 MeV) was investigated on 10- and 20-mm-thick three-point bend specimens. Measurements of critical values of the J-integral, Jc, and the crack-opening displacement, δc, defined at the onset of stable crack growth, were performed at 20 and 400°C. The electric potential method was adapted to hot-cell operation for the detection of the initiation point. Drastic reductions of fracture toughness occur when combining welding, irradiation, and high temperature. As an example, the value δc = 0.51 mm of base-material nonirradiated specimens tested at 20°C drops to 0.011 mm for welded irradiated specimens tested at 400°C. The consequences on liquid metal fast breeder reactor (LMFBR) structural design are illustrated in the case of the French LMFBR Super Phénix.

    Keywords:

    austenitic stainless steel, irradiation, weld, fracture toughness, structural design, fast breeder reactor


    Author Information:

    Dufresne, J
    Senior scientist, Commissariat à l'Energie Atomique, Fontenay-Aux-Roses,

    Henry, B
    Senior scientist and head, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra,

    Larsson, H
    Senior scientist and head, Commission of the European Communities, Joint Research Centre, Ispra Establishment, Ispra,


    Paper ID: STP38185S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP38185S


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