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タイトル: 低合金鋼の空気中および3.5%食塩水中での疲労破面のX線フラクトグラフィ(<小特集>X線材料強度小特集)
その他のタイトル: X-Ray Fractography of Fatigue Fracture of Low-Alloy steel in Air and in 3.5% NaCl Solution(<Minor Spacial Issue>Minor Spacial Issue on X-Ray Study on Deformation and Fracture of Solid)
著者: 矢島, 善次郎
広瀬, 幸雄 link image
Yajima, Zenjiro
Hirose, Yukio
Tanaka, Keisuke
発行日: 1986年 7月15日
出版社(者): 日本材料学会
雑誌名: 材料=Journal of the Society of Materials Science, Japan
ISSN: 0514-5163
巻: 35
号: 394
開始ページ: 725
終了ページ: 730
キーワード: 腐食疲労
疲労破面
X線応力測定法
残留応力
塑性域
抄録: Fatigue crack propagation tests of a low alloy steel (JIS SNCM439) tempered at 200℃ and 600℃ were conducted both in air and in 3.5% NaCl solution. The residual stress near the fatigue fracture surface was measured by the X-ray diffraction method. The results obtained are summarized as follows: (1) The residual stress measured on the fracture surface was tension both in air-fatigue and corrosion fatigue. The tensile residual stress increased with the maximum stress intensity factor K_<max> in the case of the material tempered at 200℃, while it had a maximum value at about K_<max> =30 MPa√<m> in the case of the material tempered at 600℃. When compared at the same K_<max> value, the residual stress was lower for a lower stress ratio and in corrosion fatigue. (2) The distribution of the residual stress beneath the fatigue fracture surface was able to be decomposed into two components: the tensile residual stress in the vicinity of the fracture surface caused by monotonic tensile plastic deformation, and the compressive residual stress in the vicinity of the fracture surface caused by stress relief due to roughness and by compressive plastic deforma-tion. (3) The maximum depth of the plastic zone was evaluated on the basis of the residual stress distribution. The depth ω_y is related to K_<max> by the following equation: ω_y = α(K_<max>/σ_Y)^2 where σ_Y is the yield strength obtained in tension tests. α is 0.19 for air fatigue and 0.06 for corrosion fatigue. The small value of α in corrosion fatigue suggests the hardening of the material in the plastic zone due to the environmental effect.
URI: http://hdl.handle.net/2297/12456
関連URI: http://ci.nii.ac.jp/naid/110002296868/
資料種別: Journal Article
権利関係: 日本材料学会;本文データは日本材料学会の許諾に基づきCiNiiから複製したものである
版表示: publisher
出現コレクション:1.査読済論文(工)

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