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Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.
Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07
This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.
Ha, Yoosung; Okano, Shigetaka*; Takamizawa, Hisashi; Katsuyama, Jinya; Mochizuki, Masahito*
Proceedings of ASME 2021 Pressure Vessels and Piping Conference (PVP 2021) (Internet), 6 Pages, 2021/07
Tsuji, Akihiro*; Zhang, S.*; Hashimoto, Tadafumi*; Okano, Shigetaka*; Shobu, Takahisa; Mochizuki, Masahito*
Zairyo, 65(9), p.665 - 671, 2016/09
It is necessary to control weld residual stress which has negative influence on fracture strengths. In structural steel welds, complex residual stress fields are formed due to phase transformation that occur according to the thermal cycles. In this study, in-situ evaluation of phase transformation and transitional stress simultaneously during welding is discussed. In the test using SM490A, after cooling process, stress evaluated by this system showed good agreement with that evaluated by lab X-ray. During austenite to ferrite transformation in weld metal, tensile stress occurred in austenite and compressive stress occurred in ferrite. Moreover, stress concentration was occurred in ferrite phase immediately after the start of phase transformation. Also, stress concentration was occurred in austenite phase just before the end of phase transformation.
Kadoi, Kota*; Fendong, H.*; Yuyang, H.*; Aoki, So; Okano, Shigetaka*
no journal, ,
The prediction method for the susceptibility is required for the reliability of dissimilar welding and the functional design. In this study, we targeted dissimilar metal welding of low alloy steel, SUS, and Ni-base alloy, and investigated the relationship between solidification cracking susceptibility and chemical composition in the austenite single phase region (high susceptible region to solidification cracking) with changing Fe, Ni, Cr, and Nb systematically. The Brittle temperature range (BTR) derived from the experiment was plotted on a Schaeffler microstructure diagram with an expanded Ni equivalent. This map clarified the region with high solidification cracking susceptibility. In addition, there was a high correlation between the BTR and the solidification temperature range T calculated by thermodynamic calculation. Therefore, it must be possible to predict the trend of the BTR from T and the map.
Nomura, Yusei*; Okano, Shigetaka*; Aoki, So; Kadoi, Kota*; Mochizuki, Masahito*
no journal, ,
In order to understand the dynamic state of a constant strain test for SCC susceptibility assessment, a finite element analysis was used to simulate the specimen preparation process. A U-bend specimen was used as the constant strain test, and it was found that the tendency of the stress-strain distribution at the top of the U-bend specimen may differ depending on the specimen size and the radius of curvature of the U-bend. A quantitative evaluation of these dynamic states was attempted based on strain formulae.
Zhang, S.; Shobu, Takahisa; Shiro, Ayumi; Hashimoto, Tadafumi*; Tsuji, Akihiro*; Okano, Shigetaka*; Mochizuki, Masahito*
no journal, ,
Zhang, S.; Shobu, Takahisa; Shiro, Ayumi; Hashimoto, Tadafumi*; Tsuji, Akihiro*; Okano, Shigetaka*; Mochizuki, Masahito*
no journal, ,
no abstracts in English
