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Takeuchi, Tomoaki; Kakubo, Yuta*; Matsukawa, Yoshitaka*; Nozawa, Yasuko*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Nishiyama, Yutaka; Katsuyama, Jinya; Yamaguchi, Yoshihito; Onizawa, Kunio; et al.
Journal of Nuclear Materials, 452(1-3), p.235 - 240, 2014/09
Times Cited Count：45 Percentile：94.65(Materials Science, Multidisciplinary)Microstructures and hardness of stainless steel weld overlay cladding of reactor pressure vessels subjected to the thermal aging at 400 
C for 100-10,000 h were investigated using atom probe tomography and nanoindentation technique. The Cr concentration fluctuation in the 
-ferrite phase caused by spinodal decomposition rapidly progressed by the 100 h aging while NiSiMn clusters increased in number density at 2,000 h and coarsened at 10,000 h. The hardness of the -ferrite phase also rapidly increased at the short aging time. The Cr concentration fluctuation and the hardness were in good correlation with the degree of the Cr concentration fluctuation rather than the formation of the NiSiMn clusters. These results strongly suggested that the dominant factor of the hardening of the -ferrite phase by the thermal aging was Cr spinodal decomposition.
Takeuchi, Tomoaki; Kakubo, Yuta*; Matsukawa, Yoshitaka*; Nozawa, Yasuko*; Toyama, Takeshi*; Nagai, Yasuyoshi*; Nishiyama, Yutaka; Katsuyama, Jinya; Yamaguchi, Yoshihito; Onizawa, Kunio
Journal of Nuclear Materials, 449(1-3), p.273 - 276, 2014/06
Times Cited Count：21 Percentile：80.80(Materials Science, Multidisciplinary)Microstructural changes and hardness of stainless steel weld overlay cladding of reactor pressure vessels subjected to the neutron irradiation with a dose of 7.2 
10
n cm
(E 
1 MeV) and a flux of 1.1 10
n cm s
at 290C were investigated by atom probe tomography and with nanoindentation technique. In order to isolate the effect of the irradiation, we compared the results of the measurements of the irradiated sample with that of the aged one at 300C for the time equivalent to the irradiation. The Cr concentration fluctuation was enhanced in the -ferrite phase of the irradiated sample. In addition, the enhancement of the concentration fluctuation of Si, which was not observed in the aged sample, was observed. The hardening at the -ferrite phase was occurred by both the irradiation and the aging. However, the former was more than that expected from the Cr concentration fluctuation, which suggested that the Si concentration fluctuation and irradiation-induced defects were possible origins of the additional hardening.
Takeuchi, Tomoaki; Kakubo, Yuta*; Matsukawa, Yoshitaka*; Nozawa, Yasuko*; Nagai, Yasuyoshi*; Nishiyama, Yutaka; Katsuyama, Jinya; Onizawa, Kunio; Suzuki, Masahide
Journal of Nuclear Materials, 443(1-3), p.266 - 273, 2013/11
Times Cited Count：18 Percentile：76.62(Materials Science, Multidisciplinary)Investigation on irradiation effects of weld-overlay claddings is necessary for safety assessment of reactor pressure vessels. We investigated microstructural changes in the cladding, which was composed of about 90% austenite and 10% -ferrite phases, subjected to the neutron irradiation to 7.210 n/cm
at 290C, by 3D atom probe tomography technique. In the ferrite phase, the amplitude of the Cr and Si concentration fluctuation was increased by the irradiation and Ni and Mn concentration fluctuations were newly occurred. In the austenite phase, 
'(Ni
Si) -like clusters were formed. In contrast, the results of our previous work on the cladding subjected to thermal aging showed the amplitude of the Cr fluctuation was significantly increased and G (Ni-Si-Mn) phase was formed in the ferrite phase. Moreover, no changes were observed in the austenite by the aging.
Shimizu, Michio; Iwamatsu, Shigemi; Takada, Fumiki; Sozawa, Shizuo; Kawamata, Kazuo; Oshima, Kunio; Tsuchiya, Kunihiko; Yamaura, Takayuki; Matsui, Yoshinori; Iwai, Takashi; et al.
JAERI-Tech 2000-029, p.48 - 0, 2000/03
JAERI-Tech-2000-029.pdf:9.26MB
no abstracts in English
D crystalsYamaguchi, Sadae*; Takahiro, K.*; Fujino, Yutaka*; Naramoto, Hiroshi; Ozawa, Kunio*
Journal of Alloys and Compounds, 231, p.132 - 137, 1995/00
Times Cited Count：4 Percentile：41.66(Chemistry, Physical)no abstracts in English
Morii, Yukio; Funahashi, Satoru; Ozawa, Kunio*; ; ; ;
Japanese Journal of Applied Physics, 28(4), p.L618 - L620, 1989/04
Times Cited Count：2 Percentile：17.04(Physics, Applied)no abstracts in English
Geshi, Kazuo; Nagai, Shiro; Ozawa, Kunio*
JAERI-M 88-268, 130 Pages, 1989/01
no abstracts in English
; Nagai, Shiro; Ozawa, Kunio*
Journal of Nuclear Materials, 168, p.162 - 170, 1989/00
Times Cited Count：0 Percentile：0.00(Materials Science, Multidisciplinary)no abstracts in English
; Naramoto, Hiroshi; Ozawa, Kunio*;
Nuclear Instruments and Methods in Physics Research B, 39, p.724 - 727, 1989/00
Times Cited Count：15 Percentile：81.50(Instruments & Instrumentation)no abstracts in English
; Fujino, Yutaka*; Naramoto, Hiroshi; Ozawa, Kunio*
Nuclear Instruments and Methods in Physics Research B, 39, p.409 - 412, 1989/00
Times Cited Count：4 Percentile：56.38(Instruments & Instrumentation)no abstracts in English
superconducting tape with J=10
A/cm; ; ; ; ; ; ; Ozawa, Kunio; Morii, Yukio; Funahashi, Satoru
Proc. on the ISTEC Workshop on Superconductivity, p.111 - 114, 1989/00
no abstracts in English
Sataka, Masao; Ozawa, Kunio*; Kawatsura, Kiyoshi; ; Komaki, Kenichiro*; Naramoto, Hiroshi; ; Nakai, Yota;
Journal of the Physical Society of Japan, 57(10), p.3352 - 3356, 1988/10
no abstracts in English
; Nagai, Shiro; Ozawa, Kunio*
JAERI-M 88-146, 113 Pages, 1988/08
no abstracts in English
; ; Ozawa, Kunio*
JAERI-M 87-217, 177 Pages, 1988/01
no abstracts in English
Naramoto, Hiroshi; Kawatsura, Kiyoshi; Sataka, Masao; ; Nakai, Yota; Ozawa, Kunio*; ; Fujino, Yutaka*;
Nuclear Instruments and Methods in Physics Research B, 33, p.595 - 598, 1988/00
no abstracts in English
C1 ions exiting from carbon foils; ; Kawatsura, Kiyoshi; Sataka, Masao; Ozawa, Kunio*; Komaki, Kenichiro*; ;
Nuclear Instruments and Methods in Physics Research B, 33, p.230 - 234, 1988/00
Times Cited Count：0 Percentile：0.00(Instruments & Instrumentation)no abstracts in English
Shirai, Toshizo; ; Sugar, J.*; Wiese, W. L.*; Nakai, Yota; Ozawa, Kunio*
Atomic Data and Nuclear Data Tables, 37(2), p.235 - 332, 1987/00
Times Cited Count：27 Percentile：37.29(Physics, Atomic, Molecular & Chemical)no abstracts in English
Ozawa, Kunio
Oyo Butsuri, 49(10), P. 992, 1980/00
no abstracts in English
Ozawa, Kunio; Anzai, Shuichiro*
Atsuryoku Gijutsu, 11(5), p.256 - 274, 1973/05
no abstracts in English
Kanazawa, Shingo; Sudo, Tomoyuki; Komiya, Tomokazu; Hata, Katsuro; Nakamura, Masahiko; Kozawa, Masachiyo; Ohata, Kiyoshi; Nanko, Masayuki; Hoshino, Masato; Uchida, Shinichi; et al.
no journal, ,
JAEA is working the decontamination activity for the environmental remediation of Fukushima. In this activity, we support the decontamination activity for local governments to devise actually decontaminate. In this report, we show the decontamination effect of a house.
