Shinya Imano
Mitsubishi
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Featured researches published by Shinya Imano.
Archive | 2018
Tomoki Otsuka; Hideki Wakabayashi; Daisuke Igarashi; Achmad Ariaseta; Shinya Imano; Yuting Wang; Satoru Kobayashi; Masao Takeyama
Creep of additive manufactured (AM) and wrought alloy 718 has been examined in order to understand the difference in nature between the AM and wrought alloy. Three types of homogenization (solution) treatments, 982 °C (subsolvus: SUB), 1060 °C (supersolvus: SUP) and 1200 °C (ultra supersolvus: USS) for 2 h, were employed, prior to the standard aging treatment (760 °C/10 h + 650 °C/8 h→AC) known as supersolvus aging in the wrought alloy. Note that, unlike the wrought alloy, fine particles of a few tens of nm in diameter remain with a high number density even after the USS treatment. All the specimens exhibit a similar hardness value of 500 Hv after the aging. Creep test was conducted at 650 °C under a constant stress of 630 MPa in air, and the creep rate was monitored through extensometer by linear valuable differential transducer. The creep rate (\( {{\dot{\upvarepsilon}}} \)) in the transient stage becomes slower with increasing homogenization temperature; the minimum creep rate of USS and of SUP at ~0.5% creep strain is one order of magnitude slower than that of SUB at 0.8% strain. However, in the accelerating stage, \( {{\dot{\upvarepsilon}}} \) at 2.5% strain becomes the same among the three specimens. Eventually the rupture time increases with increasing the homogenization temperature, which is 282 h, 822 h and 1006 h for SUB, SUP and USS specimens, respectively. These values are almost the same as or a little shorter than those of the wrought alloy. The rupture elongation is, however, limited to less than 5%, which is the highest for the USS specimen. The difference in creep deformation among the specimens and between the AM and wrought specimens is discussed in terms of creep rate versus time(strain) curves in conjunction with the nature of the AM and wrought microstructures.
Archive | 2010
Jun Sato; Shinya Imano; Hiroyuki Doi
Archive | 2008
Shinya Imano; Hiroyuki Doi; Jun Sato
Archive | 2013
Eiji Nishioka; Kenichi Murata; Kazuhiko c Endo; Jun Sato; Toshio c Namatame; Shinya Imano
Archive | 2013
Shinya Imano; Hironori Kamoshida
Archive | 2012
Hironori Kamoshida; Shinya Imano; Takehiko Yoshida; Seunghwan Park
Archive | 2012
Hironori Kamoshida; Shinya Imano; Takehiko Yoshida; Seunghwan Park
Archive | 2012
Eiji Nishioka; Jun Sato; Shinya Imano; Takeshi Kudo; Kenichi Murata; Kazutaka Hosokawa; Kazuhiko Endo
Archive | 2015
Atsuo Ota; Shinya Imano; Hironori Kamoshida
Archive | 2014
Takeshi Izumi; Hideyuki Arikawa; Yoshitaka Kojima; Akira Mebata; Tadashi Kasuya; Shinya Imano; Koji Miyamoto