Fractal Dimension of Grain-boundary Fracture for Characterization of High-temperature Fracture in Heat-resistant Alloys

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概要

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• The fractal dimension of the grain-boundary fracture, Df, (2<Df<3), which represents the fracture surface pattern with grain-boundary microcracks in three-dimensional space, is proposed for characterization of high-temperature fracture in materials. The value of Df as well as its two dimensional value, Dfp (the fractal dimension of the grain-boundary fracture surface profile, 1<Dfp<2), was estimated in the length scale range more than about one grain-boundary length using the height data of fracture surfaces of heat-resistant alloys obtained by the stereo matching method. The value of Df increased with increasing fractal dimension of the grain-boundary surface profile (DGB, 1<DGB<2) in the specimens of the HS-21 alloy ruptured at 1089 K. Both rupture life and creep ductility increased with increasing value of Df in these specimens. Similar results were obtained by the two-dimensional fractal analysis on other specimens of cobalt-base, nickel-base and iron-base heat-resistant alloys. Creep fracture process including the growth of the main creep crack was examined by the fractal analysis using the fractal dimension map (FDM, a color-coded map) on the surface notched specimens. The result of the fractal analysis was compared with that of the FRASTA (fracture surface topography analysis) in the Inconel X-750 alloy. The fractal analysis used in this study is more convenient and more advantageous than the FRASTA, and is widely applicable to the investigation of high-temperature fracture in materials.

• 社団法人 日本鉄鋼協会の論文
• 2009-08-15

著者

• KATO Ryuichi

  Department of Biology,Graduate School of Science,Osaka University

• Kato Ryuichi

  Department Of Biology Graduate School Of Science Osaka University

• TANAKA Manabu

  Department of Mechanical Engineering, Faculty of Engineering and Resource Science, Akita University

• Tanaka Manabu

  Department Of Mechanical Engineering Faculty Of Engineering And Resource Science Akita University

• ONO Junji

  Graduate School, Department of Mechanical Engineering, Faculty of Engineering and Resource Science,

• SAKASHITA Manabu

  Department of Mechanical Engineering, Faculty of Engineering and Resource Science, Akita University

• Ono Junji

  Graduate School Department Of Mechanical Engineering Faculty Of Engineering And Resource Science Aki

• Kato Ryuichi

  Dep. Of Mechanical Engineering Fac. Of Engineering And Resource Sci. Akita Univ.

• Tanaka Manabu

  Dep. Of Mechanical Engineering Fac. Of Engineering And Resource Sci. Akita Univ.

• Kato Ryuichi

  Technology Department Electronics Division Kobelco Research Institute Inc.

• Tanaka Manabu

  Department Of Applied Chemistry Waseda University

• Sakashita Manabu

  Department Of Mechanical Engineering Faculty Of Engineering And Resource Science Akita University

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