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Kumagai, Masayoshi*; Akita, Koichi; Imafuku, Muneyuki*; Oya, Shinichi*
Nihon Zairyo Gakkai Dai-62-Ki Tsujo Sokai, Gakujutsu Koenkai Rombunshu (USB Flash Drive), 2 Pages, 2013/05
Dislocation densities and crystallite sizes in shot- and laser-peened ANSI316 specimens were evaluated by X-ray line profile analysis. The both peened samples had almost the same depth-distributions of residual stress. Even though dislocations were increased and crystallites were refined in both processes, the dislocation density of SP was significantly higher than that of LP and the crystallite size of SP was one-third that of LP. Thus, the states of the microstructure variations were different depending on the nature of deformation process.
Shobu, Takahisa; Zhang, S.; Shiro, Ayumi; Yamada, Tomonori; Muramatsu, Toshiharu; Kono, Fumiaki; Ozawa, Takayuki
no journal, ,
no abstracts in English
Wakui, Takashi; Ishii, Hideaki*; Naoe, Takashi; Suzuki, Hiroshi; Harjo, S.; Futakawa, Masatoshi
no journal, ,
In the diffused bonding by HIP of invar alloy with a low-thermal expansion coefficient and common metal, large residual stresses occurs near the bonding line due to difference with a big thermal expansion coefficient and then we are anxious about the strength reduction by the residual stresses. In this study, some tests for bonding specimen were carried out. The diffusion layer with thickness of 50 micro meter occurred near the bonding line. The neutron diffraction method could not measure the residual stress. In tensile tests, all fractures occurred in invar alloy side and the bonding strength was higher than the strength of Invar alloy. The grain size increased with an increase of treatment temperature and the tensile strength decreased with an increase of the grain size.