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Onizawa, Takashi; Wakai, Takashi; Aoto, Kazumi
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 MX in high Cr steel during long-term aging was examined.
Kimura, Kenichi*; Mogi, Satoshi*; Nakazawa, Takanori*; Wakai, Takashi
no journal, ,
This paper describes the effect of normalizing and tempering conditions on precipitation behavior in a 9Cr alloy. It is supposed that normalizing process at 1373K followed by water quenching is adequate to achieve an ideal microstructure after tempering. Fine and densely distributed precipitates can be obtained by double tempering process at 823K and 1023K.
Obara, Satoshi; Onizawa, Takashi; Wakai, Takashi; Aoto, Kazumi
no journal, ,
no abstracts in English
Yoshida, Yu*; Mitsuhara, Masatoshi*; Ikeda, Kenichi*; Nakashima, Hideharu*; Wakai, Takashi
no journal, ,
no abstracts in English