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Report No.

Low-Cycle Fatigue Properties of SUS304 Stainless Steel in High Temperature Sodium

Hirano, Masaatsu; Kohashi, Kazuyuki*; Yuhara, Shinichi*; Nakasuji, Takashi; Atsumo, Hideo

Strain controlled fatigue tests with triangular waveform in sodium and in air at 550$$^{circ}C$$ were conducted by use of the fatigue test facilities in sodium for the purpose of establishing the fatigue testing techni- que and clarifying the fatigue bahavior in sodium. The results obtained are summarized as follows. The fatigue test technique in high temperature sodium involving the calibration method of the elongation of a specimen and push-pull rod was established. The farigue life of SUS304 stainless sttel in sodium at 550$$^{circ}C$$ was longer than that in air at the same temperature, at the same strain rate of 1$$times$$10$$^{-3}$$ sec$$^{-1}$$ and that of ASME fatigue design curve. Particularly, this tendency was larger as the strain range become lower.



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