Tohru Shiraishi
NHK Spring Company
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Featured researches published by Tohru Shiraishi.
Materials Science Forum | 2016
Takuro Nishihara; Hiroaki Matsumoto; Yohei Iwagaki; Tohru Shiraishi; Yoshiki Ono
Titanium alloys are widely used in aerospace components, with the most widely used alloy being (α+β)-type Ti-6Al-4V (hereafter designated as Ti-64) alloy owing to its high specific strength and high formability associated with superplasticity. This work examines the tensile deformation behavior of the Ti-64 alloy with the acicular α′ martensite microstructure tested at from 700°C to 900°C. Higher tensile-elongation and higher strain-rate-sensitivity value are seen in the Ti-64 alloy with the α′ martensite microstructure as compared to that with the lamellar (α+β) microstructure. During deformation of the α′ martensite microstructure at 700°C or 800°C, acicular microstructure evolves into fine equiaxed (α+β) structure, whereas there is no apparent change in microstructure in the case of the lamellar (α+β) starting microstructure. This result indicates that dynamic globularization during deformation is strongly enhanced in the acicular α′ martensite starting microstructure, thereby leading to higher tensile elongation.
Materials Science Forum | 2010
Nobuyuki Fuyama; Akira Terayama; Toshio Fujii; Tohru Shiraishi; Yuki Miyake; Gen Sasaki
Metallic fibers (Fe-Cr-Si) with an excellent high temperature strength are expected to be use as a reinforced material of the engine piston head. However, the high reactivity of Al with most metals has disturbed the use of metallic fibers in aluminum composites until now. In this study, the influence of the reaction products at the fiber/matrix interface on high temperature properties of the composites was investigated by different solution treatment conditions. It is found that hardness and strength increase with an increase the solution treatment temperature (Tst). Reaction products (Al-Fe intermetallic compounds) resulting from solution treatments were formed along the fiber/matrix interface at 773 K or higher. The composites without interfacial reaction products (Tst=763 K) showed excellent rotating-bending fatigue life at 573 K. The fatigue crack propagation in this composite occurred at the necking region of the metal fiber because no cracks were observed in the interfacial reaction products.
Archive | 2005
Teruyuki Oda; Akihiro Katsuya; Tohru Shiraishi
Archive | 2012
Tohru Shiraishi; Yoshiki Ono; Yuji Araoka
Archive | 2013
Yuitirou Ono; Tohru Shiraishi; Yoshiki Ono; Keita Takahashi
Archive | 2012
Kazuya Ikai; Tohru Shiraishi; Yuichiro Ono; Yoshiki Ono
Archive | 2001
Toshihiro Takehana; Akihiro Katsuya; Tohru Shiraishi
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing | 2016
Hiroaki Matsumoto; Takuro Nishihara; Yohei Iwagaki; Tohru Shiraishi; Yoshiki Ono; Akihiko Chiba
Archive | 2011
Yuji Araoka; Tohru Shiraishi; Yoshiki Ono
Archive | 2015
Yuji Araoka; Tohru Shiraishi; Yoshiki Ono