STP956

    Effects of 14-MeV Neutron Irradiations on Mechanical Properties of Ferritic Steels

    Published: Jan 1987


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    Abstract

    Seven kinds of 9Cr-2Mo type ferritic steels were irradiated at 300, 473, and 673 K with 14-MeV neutrons from Rotating Target Neutron Source II (RTNS-II) at Lawrence Livermore National Laboratory (LLNL). The maximum neutron fluence was 4 × 1022 n/m2. Post-irradiation mechanical property tests, microVickers hardness tests, microtension tests, and micro-bulge tests were performed. Microstructural evolutions under irradiation were examined by transmission electron microscopy.

    Irradiation hardening and softening were observed at 300 K and at elevated temperatures, respectively. Radiation induced defect cluster formation was observed. The clusters were identified as mostly vacancy type complex defects from their fluence dependence. The irradiation hardening can be reasonably explained by the dispersion hardening from these complex defects. The correlation of mechanical properties among miniaturized sample tests, which are initially derived for unirradiated materials, have proved to be valid for the neutron irradiated specimens with fluences up to 4 × 1022 n/m2. Specimen size effects on tension test results were investigated.

    Keywords:

    radiation, ferritic stainless steels, dual phase steel, 14-MeV neutron, miniaturized sample testing, size effect, radiation hardening, defect cluster, Vickers hardness, microbulge tests


    Author Information:

    Kohyama, A
    Associate professor, graduate student, and professor, The University of Tokyo, Tokyo,

    Asano, K
    Associate professor, graduate student, and professor, The University of Tokyo, Tokyo,

    Igata, N
    Associate professor, graduate student, and professor, The University of Tokyo, Tokyo,


    Paper ID: STP25644S

    Committee/Subcommittee: E10.07

    DOI: 10.1520/STP25644S


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