SYMPOSIA PAPER Published: 01 January 1994

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


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).

Author Information

Aixin, YJ
CIAE, Beijing, China
Han, RP
CIAE, Beijing, China
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Developed by Committee: E10
Pages: 622–627
DOI: 10.1520/STP23962S
ISBN-EB: 978-0-8031-5262-5
ISBN-13: 978-0-8031-1488-3