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首页> 外文期刊>ISIJ international >Direct Observations of Cracks and Voids in Structural Materials by X-ray Imaging Using Ultra-bright Synchrotron Radiation
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Direct Observations of Cracks and Voids in Structural Materials by X-ray Imaging Using Ultra-bright Synchrotron Radiation

机译：通过使用超亮同步辐射的X射线成像直接观察结构材料中的裂纹和空隙

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摘要

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 3m, 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 X-ray 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.
机译：使用超亮同步辐射X射线，对带有人造圆柱孔的丙烯酸树脂，A7075铝合金，A6063铝铸件，具有裂纹或空隙的低碳钢和含有夹杂物的低合金钢进行了折射对比X射线成像实验。 SPring-8的BL24XU Hutch C中的横梁。为了比较，还进行了常规的吸收对比X射线成像实验。通过Si双晶体将X射线束控制为单色，并且通过狭缝将其准直。样品和检测器之间的距离从0更改为3m，X射线能量为15到25 keV。通过X射线胶片和/或X射线CCD照相机拍摄照片。结果，与吸收法相比，折射成像法给出了丙烯酸树脂中的人造圆柱孔的明显得多的图像。还清楚地观察到铝合金和低碳钢的疲劳裂纹。 X射线成像显示低合金钢中存在MnS非金属夹杂物。通过成像可以清楚地检测出铝铸件中的空隙缺陷。此外，使用高分辨率X射线CCD相机系统成功地进行了铝合金拉伸断裂的现场观察。使用非对称反射技术进行X射线成像实验的观察也表现出色。从上面可以得出结论，使用超亮同步加速器辐射的X射线成像方法对于材料的断裂研究非常有用。

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