Koichi Teshima
Toshiba
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Publication
Featured researches published by Koichi Teshima.
Journal of Materials Science | 1986
Michihiko Inaba; Koichi Teshima; Yoshinori Honma; Tsutomu Yamashita; Isao Suzuki; Masaharu Kanto
The effects of trace impurities on the adherence of oxides to ultra low carbon steels were investigated. Three steels, of differing chromium, aluminium, silicon, nitrogen and oxygen content, were oxidized at 850 K in 10% CO2-90% N2 gas and then oxidized at 770 K in 10% CO2-10% O2-80% N2 gas. Surface analysers, i.e. a Mössbauer spectrometer, Auger electron spectrometer and/or ion micro analyser, were utilized in the present study because of the very thin layer of oxides formed (1.0 to 2.0 µm). The following results were obtained. The oxide on the Al-containing steel spalled at the outer-inner oxide interface, where aluminium was enriched and many cavities appeared. The inner oxide layer, oxidized by the transport of CO2 or O2 gases along the outer layer grain boundaries or micropores, became thick. This generated a stress at the outer-inner layer interface with the resultant formation of cavities. On the other hand, the oxide on the Cr-containing steel showed good adherence to the metal. The inner layer, enriched with chromium, did not become thick and had no cavities at the interface. The addition of chromium to the Al-containing steel resulted in good oxide adherence because chromium acted as a barrier to the aluminium enrichment.
Archive | 1994
Koichi Teshima; Yoshinori Fujimori; Shin-ichi Nakamura; Masayuki Fukuda; Michihiko Inaba; Emiko Higashinakagawa; Yasuhisa Ohtake; Eiichi Akiyoshi
Archive | 1982
Masaharu Kanto; Hisato Kihara; Koichi Teshima; Michihiko Inaba
Archive | 1997
Yoshiaki Yokoyama; Teruhisa Ogihara; Koichi Teshima; Tomohiro Todoroki; Terunobu Hayata; Fuminobu Tezuka; Masao Koyama; Naohiko Oyasato; Tomiaki Furuya; Kaichiro Ogihara
Journal of Materials Science Letters | 1987
Michihiko Inaba; Koichi Teshima
Archive | 2007
Yoshiaki Yokoyama; Teruhisa Ogihara; Koichi Teshima; Tomohiro Todoroki; Terunobu Hayata; Fuminobu Tezuka; Masao Koyama; Naohiko Oyasato; Tomiaki Furuya; Kaichiro Ogihara
Journal of The Japan Institute of Metals | 1984
Michihiko Inaba; Yoshinori Honma; Koichi Teshima; Osamu Hirao; Toshiharu Sakurai
Journal of Materials Science Letters | 1984
Michihiko Inaba; Koichi Teshima; Osamu Hirao; Toshiharu Sakurai
Archive | 1982
Koichi Teshima; Masakazu Yamada; Toshiharu Sakurai; Takemi Abe
Archive | 1982
Masaharu C O Patent Divi Kanto; Hisato Kihara; Koichi Teshima; Michihiko Inaba