著者

座光寺 伸治 杉本 公一 深田 茂生

出版者

一般社団法人 日本機械学会

雑誌

北陸信越支部総会・講演会 講演論文集 2010.47 (ISSN:24242772)

巻号頁・発行日

pp.323-324, 2010-03-05 (Released:2017-06-19)

著者

伊藤 寛明 伊藤 耕史 荒井 政大 杉本 公一 松倉 利顕 小飼 俊勝

出版者

公益社団法人精密工学会

雑誌

精密工学会誌論文集 = Journal of the Japan Society for Precision Engineering Contributed Papers (ISSN:13488724)

巻号頁・発行日

vol.70, no.6, pp.807-811, 2004-06-05

参考文献数

15

被引用文献数

3 1

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To apply glass-like carbon (GC) to precision die for press-molding of optical glass lens, the wettability between optical glasses and the GC materials was investigated in nitrogen, argon or air atmosphere heated up to 900-1050°C. The GC material calcinated at about 2000°C (GC20) exhibited larger contact angle than that of the GC materials calcinated at 1300°C or 3000°C. This was caused by that calcination at 1300°C or 3000°C promoted graphite reaction of the GC materials. When the contact angle between the GC20 material and some commercial glasses with different chemical composition was compared, kron (Crown) glass achieved the same large contact angle as flint glass. In the kron glass, lower adhesion or more melted fragment of glass was also observed on the GC20 surface. It was expected that a lack of PbO, Na₂O and K₂O brought on good characteristics of the kron glass.

著者

杉本 公一 小林 純也 北條 智彦

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.1, pp.1-11, 2017 (Released:2016-12-31)

参考文献数

132

被引用文献数

1 24

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This paper introduces the microstructure, retained austenite characteristics, strain-induced transformation-deformation mechanism and mechanical properties of transformation-induced plasticity (TRIP)-aided martensitic (TM) steels for the automotive applications. Because the microstructure consists of a wide lath-martensite structured matrix and a mixture of narrow lath-martensite and metastable retained austenite (MA-like phase), the TM steel produced a good combination of tensile strength and cold formability. If Cr and/or Mo were added into 0.2%C-1.5%Si-1.5%Mn steel to enhance its hardenability, the resultant TM steel achieved superior notch fatigue strength and impact and fracture toughness to conventional structural steel such as SCM420. These enhanced mechanical properties were found to be mainly caused by: (1) plastic relaxation of the stress concentration, which results from expansion strain on the strain-induced transformation of the metastable retained austenite; and (2) the presence of a large quantity of finely dispersed MA-like phase, which suppresses crack or void initiation and subsequent connection.

著者

杉本 公一

出版者

信州大学

雑誌

基盤研究(B)

巻号頁・発行日

2008

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超高圧コモンレール用の材料として,3000気圧の使用に耐える焼入れ性を高めた0.2-0.4%C-1.5%Si-1.5%Mn-0.05%Nb-Cr-Mo-Ni-B系低合金TRIP型ベイニテイックフェライト鋼(TBF鋼)とTRIP型マルテンサイト鋼(TM鋼)を開発した.また,それらTRIP鋼の強靭性と切欠き疲労強度に対して,(1)最適な合金組成,(2)熱間鍛造熱処理による超微細粒化技術,(3)ベイニテイックフェライト/マルテンサイト(BF/M)組織率の同定法と残留オーステナイト(γ_R)への炭素の濃化機構,を提案した.