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    STP1175

    Effects of Neutron Irradiation on the Notch Ductility of 15MnTi Steel

    Published: 01 January 1994


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    Abstract

    15MnTi steel as a support plate must withstand both the weight of the reactor core of about 100 tons and dynamic loads at 40°C to 50°C. In this study, the steel was embrittled by the neutron irradiation from the reactor core. The ductile-brittle transition temperature was also increased.

    The specimens were taken from base plate, weld metal, and weld heat-affected zone. The specimens were irradiated in a swimming pool reactor (SPR).

    The test results included impact energy (αk), reference transition temperature (RTNDT), and transition temperature increase (ΔTcv) of 15MnTi steel under the neutron exposure 1 to 2 × 1018n/cm2(E > 1 MeV). The transition temperature was 6°C and 2°C for base plate and weld metal, respectively, after 1 × 1018n/cm2(E > 1 MeV) at 50°C. The transition temperature increase was 40°C, 41°C, and 32°C for base plate, weld metal, and weld heat-affected zone, respectively, after about 2 × 1018n/cm2(E > 1 MeV) at 50°C.

    The data of transition temperature increased on 15MnTi steel after 1 to 6 × 1018n/cm2(E > 1 MeV) at 50°C was summarized. An empirical equation was obtained: T = 32.7 - 1.8 lnϕt + 17.8 ln2ϕt, where ϕt is fast neutron exposure (E > 1 MeV).

    Keywords:

    irradiation effects, impact, steel, ductile-brittle transition temperature


    Author Information:

    Aixin, YJ
    Director, Associate Research, and engineer, CIAE, Beijing,

    Han, RP
    Director, Associate Research, and engineer, CIAE, Beijing,


    Committee/Subcommittee: E10.08

    DOI: 10.1520/STP23962S