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Morooka, Satoshi; Koyama, Motomichi*; Kawasaki, Takuro; Harjo, S.
no journal, ,
Mao, W.; Gao, S.*; Gong, W.; Kawasaki, Takuro; Ito, Tatsuya; Harjo, S.
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The yield strengths of traditional austenitic stainless steels (ASSs), such as 304 ASS, remain relatively low at cryogenic temperatures, due to the face-centered cubic crystal structure. Recent studies reveal that ultrafine-grain (UFG) refinement of 304 ASS can be easily achieved by heavy cold-rolling and subsequent annealing. Compared to conventional 304 ASS with coarse grains, at room temperature, the UFG 304 ASS has significantly higher yield strength owing to the grain refinement strengthening, while it still maintains good ductility. However, the low-temperature mechanical properties of UFG 304 ASS are still unclear. In this study, we systematically investigated the tensile deformation behavior of an UFG 304 ASS at different temperatures ranging from 77 to 295 K. The results showed that the optimal mechanical properties were achieved at 77 K, with extremely high yield strength and ultimate tensile strength as well as a relatively good elongation. The low-temperature deformation mechanism of UFG 304 ASS was discussed in light of in situ neutron diffraction and microstructure observation.
Gong, W.; Kawasaki, Takuro; Mao, W.; Ito, Tatsuya; Harjo, S.
no journal, ,
Ito, Tatsuya; Ogawa, Yuhei*; Gong, W.; Mao, W.; Kawasaki, Takuro; Okada, Kazuho*; Shibata, Akinobu*; Harjo, S.
no journal, ,
no abstracts in English