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Xu, P. G.; Ojima, Mayumi*; Suzuki, Hiroshi; Nambu, Shoichi*; Inoue, Junya*; Onuki, Yusuke*; Harjo, S.; Akita, Koichi
no journal, ,
Oba, Yojiro; Morooka, Satoshi; Oishi, Kazuki*; Suzuki, Junichi*; Tsuchiyama, Toshihiro*; Gilbert, E. P.*
no journal, ,
Since microstructures of steels are closely related to their mechanical properties, the characterization of the microstructures is important. Neutron scattering techniques are useful for the characterization of the steel and widely utilized. On the other hand, recent development of the neutron transmission analysis enables the characterization of the microstructure using the neutron transmission similar to the conventional neutron scattering measurements. The possibilities of advanced experiments using neutron scattering and transmission measurements are discussed for the characterization of the microstructure.
Miura, Hiromi*; Kobayashi, Masakazu*; Todaka, Yoshikazu*; Watanabe, Chihiro*; Aoyagi, Yoshiteru*; Oba, Yojiro
no journal, ,
Heavy cold rolling can develop unique mixed structures with nano-lamellar, shear bands and mechanical nano-twins in various kinds of stainless steels. In particular, "eye-shaped" twin domains developed in 
phase are a main feature of the mixed structures. The heavily cold rolled stainless steels possessed a high tensile strength over 1.5 GPa as well as a ductility of 10%. The strength increased to 2.0 GPa by ageing. This indicates that the heavily cold rolling can produce excellent structural materials having high strength and ductility.