ハステロイ-X の高温における中性子照射脆化

概要

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Ductility loss of neutron-irradiated Hastelloy-X at elevated temperatures has been examined by post irradiation tensile test. The results were analysed as a function of test temperature, strain rate, thermal neutron fluence and the associated helium content. The contribution of helium production due to the ^<58>Ni(n, γ) ^<59>Ni(n, α) ^<56>Fe reaction in addition to the ^<10>B(n, α) ^7Li reaction was considered. The results obtained are summarized as follows : (1) The post irradiation ductility decreased with strain rate decrease and test temperature increase up to 1000℃. (2) As for the helium embrittlement attributed to (n, α)-reaction, the ^<10>B(n, α) ^7Li reaction was dominant at lower fluences, and Ni-two step reaction became predominant with fluence increase. (3) Extrapolations of the results of irradition at low temperature gave the ductility values of about 3.5% at 900℃ and about 1.5% at 1000℃ for the thermal neutron fluence of 10^<22>n/cm^2. (4) The threshold thermal neutron fluences for embrittlement were estimated as 6×10^<16>n/cm^2 at 900℃ and 2×10^<16>n/cm^2 at 1000℃, corresponding to the calculated atomic helium fractions of 9.4×10^<-10> and 3.2×10^<-10>, respectively.
社団法人日本鉄鋼協会の論文
1982-04-01