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Yamashita, Shinichiro; Hashimoto, Naoyuki*; Oka, Hiroshi*
no journal, ,
In order to understand irradiation behavior of RA-MEA, CrFeMnNi alloy, up to the range of irradiation dose exceeding 100 dpa and demonstrate the applicability of AM to some of FCC single-phase nuclear materials, ion irradiation testing was performed. The conclusions obtained are as follows: In both microstructures of CrFeMnNi alloy prepared by conventional arc-melting or AM, a dense and fine cavity formed due to ion-irradiation over 200 dpa. However, estimated swellings (
V/V), which were calculated on the assumption that the thickness of all thin film samples is constant in this study, were 0.20% for arc-melted CrFeMnNi alloy and 0.63% for SLMed CrFeMnNi alloy, respectively. In the case of RA-MEAs, regardless of the difference in fabrication method, it was experimentally confirmed that RA-MEAs have high dimensional stability. In both microstructures of 316L after ion-irradiation over 200 dpa, void formation was confirmed. Void size distribution in SLMed 316L was quite different from that in arc-melted 316L, leading to the difference in estimated swellings between SLMed and arc-melted 316Ls; 0.52% (SLM) vs 6.61% (Arc-melting) This can be explained attributing to the difference in initial microstructure. Superior irradiation resistance in RA-MEA and Applicability of AM to nuclear structural materials were successfully confirmed.
Saito, Toshiki*; Yu, H.*; Inoue, Koji*; Zimo, G.*; Kondo, Sosuke*; Kasada, Ryuta*; Nagai, Yasuyoshi*; Oba, Yojiro; Hiroi, Kosuke
no journal, ,
no abstracts in English
Meigo, Shinichiro
no journal, ,
Displacements per atom (dpa) is evaluated by multiplying the integrated particle flux by the displacement cross-section. It is known that irradiation-induced material properties are well described by dpa regardless of the incident particle species. However, experimental data on the standard displacement cross-section are scarce, and the calculation model used for the cross section could not be evaluated. To contribute to the safety of the Japan Proton Accelerator Research Complex (J-PARC), we measured the displacement cross-sections using a few GeV protons. The J-PARC center aims to construct a new multi-purpose facility for testing materials used in transmutation systems and nuclear fusion, post-irradiation testing of targets after use in the J-PARC facility, and semiconductor soft-error testing using cosmic neutrons. The needs of this facility and the formation of the user community will be reported.