著者

金澤 健二 山口 弘二 佐藤 守夫 鈴木 直之 金尾 正雄

出版者

公益社団法人 日本材料学会

雑誌

材料 (ISSN:05145163)

巻号頁・発行日

vol.30, no.332, pp.454-460, 1981-05-15 (Released:2009-06-03)

参考文献数

16

被引用文献数

1 1

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In order to obtain basic data for high-temperature, high-cycle fatigue properties of S45C(0.45C) and SCM435 (0.35C, 1Cr, 0.15Mo) steels, rotating bending fatigue tests were carried out up to 108 cycles on smooth and two kinds of notch specimens at room temperature, 200, 300, and 500°C with a frequency of 125Hz.The fatigue strength at 108 cycles and the S-N curves up to 108 cycles were found to change depending upon test temperature and stress concentration factor. The temperature and material dependences of fatigue strength of the smooth specimen were explained qualitatively by the blue brittleness phenomenon of the materials used.Cracks were observed on the cross section of specimens endured 108 cycles sometimes depending on the test condition. The temperature dependence of the change in fatigue strength due to the variation of stress concentration factor corresponded to the existence of such cracks. The notch root curvature for branch point at 400∼500°C was larger than that at room temperature to 300°C. It is considered that oxidation film formed at the surface of crack plays an important role in delaying for crack to propagate.

著者

太田 昭彦 渡辺 修 松岡 一祥 志賀 千晃 西島 敏 前田 芳夫 鈴木 直之 久保 高宏

出版者

社団法人溶接学会

雑誌

溶接学会論文集 : quarterly journal of the Japan Welding Society (ISSN:02884771)

巻号頁・発行日

vol.18, no.1, pp.141-145, 2000-02-05

参考文献数

18

被引用文献数

22

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The fatigue strength of developed box welds was improved about two times of the conventional box welds. The improved welds used the low transformation temperature welding material which contains 10% Cr and 10% Ni. The expansion of the developed welding material was 0.55% due to the transformation from austenite to martensite. This expansion induced the compressive residual stress around welds. On low stress range condition, the stress ratio effect by this compressive residual stress avoids the fatigue crack initiation at the weld toe. On high stress range condition, the fatigue crack initiated from weld toe and the fretting was observed on the fractured surface. While in the conventional welds, no trace of fretting was observed.

著者

鈴木 直之 前田 芳夫 萩原 行人

出版者

社団法人溶接学会

雑誌

溶接学会全国大会講演概要

巻号頁・発行日

no.73, pp.256-257, 2003-09-08