Dai Hamaguchi
Japan Atomic Energy Agency
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Featured researches published by Dai Hamaguchi.
Materials Science Forum | 2010
Yoshiyuki Takayama; Ryuta Kasada; Kiyohiro Yabuuchi; Akihiko Kimura; Dai Hamaguchi; Masami Ando; Hiroyasu Tanigawa
The effects of small amount (1 or 2 wt.%) of Ni additionson the irradiation hardening of the reduced-activation ferritic/martensitic steel, F82H, used as fusion reactor blanket structural materials were investigated by means of Fe-ion irradiation experimental test method and nano-indentation technique. The ion-irradiation hardening of Ni-added F82H is larger than that of the steel without Ni addition. The methodology to derive the irradiation hardening of ion-irradiated F82H steel was proposed from the results of hardness depth profile.
Journal of Nuclear Science and Technology | 2018
Hideo Sakasegawa; Hiroyasu Tanigawa; Dai Hamaguchi
ABSTRACT Reduced activation ferritic/martensitic steels (RAFMs) have been developed for the structural material of fusion reactor blanket. Extensive researches were conducted using transmission electron microscopy (TEM) to define the precipitation behavior of MX (M: Metallic elements, X: C and/or N) precipitates such as vanadium and tantalum carbides and/or nitrides, since they strongly affect material properties. However, it is not completely defined yet. TEM can obtain detailed information, but the observable volume is limited and it needs a long time to obtain representative and statistically reliable microstructural information. It is fruitful to complement TEM results applying other characterization techniques together. In this work, we studied the precipitation behavior of MX in the RAFM, F82H, through the application of various techniques with larger observable volumes and compared with TEM past results. We additionally tried to find sub-nanometric MX precipitates that can be hardly observed through TEM. From the result, the TaX (X: C and/or N) phase surely varied depending on the chemical composition of alloy and heat treatment; some TaX precipitates were unstable during tempering, MX precipitates were intergranular, and sub-nanometric MX were not found in the matrix. These obtained results were helpful to define the precipitation behavior of MX in F82H.
Journal of Nuclear Materials | 2013
Yoshiyuki Takayama; Ryuta Kasada; Y. Sakamoto; Kiyohiro Yabuuchi; A. Kimura; Masami Ando; Dai Hamaguchi; Hiroyasu Tanigawa
Fusion Engineering and Design | 2014
Ryuta Kasada; Satoshi Konishi; Kiyohiro Yabuuchi; Shuhei Nogami; Masami Ando; Dai Hamaguchi; Hiroyasu Tanigawa
Fusion Engineering and Design | 2014
Takanori Hirose; Takashi Nozawa; Roger E. Stoller; Dai Hamaguchi; Hideo Sakasegawa; Hiroyasu Tanigawa; Hisashi Tanigawa; Mikio Enoeda; Yutai Katoh; Lance Lewis Snead
Journal of Nuclear Materials | 2011
P. Hosemann; Erich Stergar; Lei Peng; Y. Dai; S.A. Maloy; Manuel A. Pouchon; K. Shiba; Dai Hamaguchi; H. Leitner
Journal of Nuclear Materials | 2009
Dai Hamaguchi; H. Iwakiri; T. Kawamura; H. Abe; Takeo Iwai; Kenji Kikuchi; N. Yoshida
Journal of Nuclear Materials | 2012
Shigeru Saito; Kenji Kikuchi; Dai Hamaguchi; Masao Tezuka; Masanori Miyagi; Hiroyuki Kokawa; Seiichi Watanabe
Fusion Engineering and Design | 2016
Ryuta Kasada; Satoshi Konishi; Dai Hamaguchi; Masami Ando; Hiroyasu Tanigawa
Journal of Nuclear Materials | 2010
Shigeru Saito; Kenji Kikuchi; Dai Hamaguchi; Kouji Usami; A. Ishikawa; Y. Nishino; Shinya Endo; Masayoshi Kawai; Yong Dai
