期刊论文详细信息
JOURNAL OF NUCLEAR MATERIALS 卷:545
Effects of helium on irradiation response of reduced-activation ferritic-martensitic steels: Using nickel isotopes to simulate fusion neutron response
Article
Kim, B. K.1,4  Tan, L.1  Sakasegawa, H.1,2  Parish, C. M.1  Zhong, W.1  Tanigawa, H.3  Katoh, Y.1 
[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[2] Japan Atom Energy Agcy, Okayama 7080698, Japan
[3] Natl Inst Quantum & Radiol Sci & Technol, Aomori 0393212, Japan
[4] Korea Inst Ind Technol, Dongnam Reg Div, Busan 46938, South Korea
关键词: Neutron irradiation;    Microstructures;    Dislocation loops;    Precipitates;    Radiation-induced hardening and softening;   
DOI  :  10.1016/j.jnucmat.2020.152634
来源: Elsevier
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【 摘 要 】

Understanding the effects of helium on microstructures and mechanical properties of reduced-activation ferritic-martensitic steels is important to use of these steels in fusion reactor structures. The 9Cr-2WVTa steels were doped with Ni-58 and Ni-60 isotopes at 2 weight percent to control the rate of transmutation helium generation. The samples were irradiated in the High Flux Isotope Reactor to similar to 24 displacements per atom at nominal temperatures of 300, 400, and 500 degrees C, producing 228 and 7 atomic parts-per-million helium in the Ni-58- and Ni-60-doped samples, respectively. Transmission electron microscopy revealed a variety of precipitates and the radiation-induced dislocation loops and cavities (voids or helium bubbles). Tensile tests of the irradiated samples at the irradiation temperatures showed radiation-induced hardening at 300 degrees C and radiation-induced softening at 400 degrees C. Analysis indicates that the hardening primarily originated from the loops and cavities. The Ni-58-doped samples had greater strengthening contributions from loops and cavities, leading to higher hardening with lower ductility than the Ni-60-doped samples. The greater helium production of Ni-58 did not show pronounced reductions in ductility of the samples. (C) 2020 Elsevier B.V. All rights reserved.

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