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タイトル: 高張力鋼の応力腐食割れのフラクトグラフィ的研究(<小特集>X線材料強度小特集)
その他のタイトル: Fractographic Study of Stress Corrosion Cracking in High Strength Steel(<Minor Special Issue>Minor Special Issue on X-Ray Study on Deformation and Fracture of Solid)
著者: 広瀬, 幸雄 link image
田中, 啓介
矢島, 善次郎
岡林, 邦夫
Hirose, Yukio
Tanaka, Keisuke
Yajima, Zenjiro
Okabayashi, Kunio
発行日: 1979年 3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: 28
号: 306
開始ページ: 189
終了ページ: 195
キーワード: 応力腐食割れ
フラクトグラフィ X線応力測定
抄録: The fracture surface of stress corrosion cracking of tempered SNCM 8 steel in a 3.5% NaCl solution environment was observed by means of scanning electron microscopy and the X-ray diffraction technique. A quantitative nature of the topography and the residual stress of the fracture surface were found to be more closely related to the crack growth rate than to the stress intensity factor. The relation between the areal fraction φ of prior-austenite grain boundary fracture in the fracture surface and the growth rate da/dt of stress corrosion cracks was obtained as da/dt = exp (A - Cφ) where A is a constant dependent on tempering temperature while C is independent. The residual stress σ_R measured on the fracture surface by the X-ray method was tensile and changed as a function of the areal fraction of grain boundary fracture: σ_R= (1-φ)σ^^-R The mechanical field neat the tip of a stress corrosion crack with microbranching was modeled by a blunt crack with the equivalent root radius ρ_<eq>. The equivalent stress intensity factor given by K_<eq> = √<pl/p_<eq>> K was proposed to be a fracture mechanics parameter for characterizing the near-tip field, thus the crack growth rate. The value of p<eq> is twice the microbranching width of the crack and p_1 is the limiting root radius for a sharp crack. The concept the equivalent stress intensity factor may explain the finding that the fractographic feature is more closely related to the crack growth rate than to the stress intensity factor.
URI: http://hdl.handle.net/2297/12470
関連URI: http://ci.nii.ac.jp/naid/110002298088/
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

このアイテムを引用あるいはリンクする場合は次の識別子を使用してください。 http://hdl.handle.net/2297/12470



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