Direct Observations of Cracks and Voids in Structural Materials by X-ray Imaging Using Ultra-bright Synchrotron Radiation

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概要

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• Refraction contrast X-ray imaging experiments were conducted on acrylic resin with an artificial cylindrical hole, A7075 aluminum alloy, A6063 aluminum castings, mild steel with cracks or voids, and low alloy steel with inclusions, using a ultra-bright synchrotron radiation X-ray beam in BL24XU hutch C of SPring-8. Conventional absorption contrast X-ray imaging experiments were also done for the comparison. The X-ray beam was controlled to be monochromatic by Si double-crystals and collimated by a slit. The distance between the sample and the detector was changed from 0 to 3 m, and the X-ray energy was 15 to 25 keV. Photographs were taken by X-ray film and/or X-ray CCD camera. As a result, the refraction imaging method gave a much more distinct image of the artificial cylindrical hole in acrylic resin as compared with the absorption method. The fatigue cracks in aluminum alloy and mild steel were also distinctly observed. The Xray imaging revealed the presence of MnS nonmetallic inclusions in low alloy steel. Void defects in aluminum castings were clearly detected by the imaging. In addition, in-situ observation of tensile fracture of aluminum alloys using a high resolution X-ray CCD camera system was successfully conducted. The observations by use of asymmetric reflection technique for X-ray imaging experiment were also well performed. From above, the X-ray imaging method using ultra-bright synchrotron radiation is concluded to be very useful for fracture research of materials.

• 社団法人 日本鉄鋼協会の論文
• 2003-04-15

著者

• NAKAYAMA Takenori

  Materials Research Laboratory, Kobe Steel, LTD.

• Tsubokawa Yoshiyuki

  Kobelco Research Institute

• Matsui Junji

  Himeji Institute Of Technology

• YUSE Fumio

  Materials Research Laboratory, Kobe Steel, Ltd.

• Nakayama T

  Materials Research Laboratory Kobe Steel Ltd.

• Nakayama Takenori

  Materials Research Laboratory Kobe Steel Ltd.

• Yuse Fumio

  Materials Research Laboratory Kobe Steel Ltd.

関連論文

• Evaluation of Susceptibility to Hydrogen Embrittlement of 7075 Aluminum Alloy by Hydrogen Addition Using Flax-Treatment Method
• Selective Excitation of a Symmetric Interference Plasmon Mode in Two Close Planar SiO_2/Si Interfaces Observed by Electron Energy-Loss Spectroscopy
• Direct Observations of Cracks and Voids in Structural Materials by X-ray Imaging Using Ultra-bright Synchrotron Radiation
• Roughness Estimation of Polycrystalline Iron Surface under High Temperature by Small Glancing Angle X-ray Scattering

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