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Yamamoto, Hiroyuki; Yamada, Yoichi; Matsue, Hideaki; Soyama, Kazuhiko; Esaka, Fumitaka; Sasase, Masato*
no journal, ,
Non-destructive depth profiling of steel surface by quantum beam has been introduced. Hard X-ray photoelectron spectroscopy using synchrotron radiation and neutron depth profiling using reactor have been applied for surface analysis.
Nagae, Yuji; Wakai, Takashi
no journal, ,
no abstracts in English
Onizawa, Takashi; Wakai, Takashi; Obara, Satoshi; Asayama, Tai
no journal, ,
High Cr steel for structural material of fast breeder reactors request high ductility and toughness during long term. V and Nb are believed to improve the high temperature strength of high Cr steels by precipitating as carbides and/or nitrides, namely fine MX particles. However, the long term efficiency and stability of such precipitation strengthening mechanisms provided by the fine MX particles have not been clarified yet. A series of trial products controlling V and Nb contents is produced and mechanical tests are conducted to investigate the effect of these elements on the mechanical properties and the long term stability of the MX strengthening mechanism. In this study, stability of NbX in high Cr steel under creep deformation was examined.
Ebihara, Kenichi; Suzudo, Tomoaki; Kaburaki, Hideo; Takai, Kenichi*
no journal, ,
Hydrogen embrittlement of the grain boundary is one of factors causing the delayed fracture of high strength steel. In order to understand the phenomenon, it is important to estimate the amount of hydrogen segregating to grain boundaries. Hydrogen desorption profile obtained by the thermal desorption analysis is mainly used for the estimation of segregated hydrogen. We have already simulated the hydrogen desorption profile using the numerical model into which is incorporated the Oriani's local equilibrium hypothesis and the trap-detrap process. We consider the effect of hydrogen diffusion on the profile using our model and other models reported previously.
Ukai, Shigeharu*; Chikada, Nobuyoshi*; Hayashi, Shigenari*; Onuki, Somei*; Kaito, Takeji; Otsuka, Satoshi
no journal, ,
The 9Cr-ODS ferritic steel for fast reactor fuel cladding tube has been developed by JAEA. This study discussed the mechanism of high-temperature strength improvement produced by feeritic/martensitic duplex structure.
Miyashita, Yuta*; Nakazawa, Takanori*; Obara, Satoshi; Yamazaki, Masayoshi*; Hongo, Hiromichi*
no journal, ,
no abstracts in English