Micro-CT detection of small defects in additive manufacturing
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摘要:
通过高精度金属增材制造技术设计制造了两组不同类型的缺陷试件,并基于显微CT检测技术和缺陷解剖金相检测方式,研究显微CT对增材制造小缺陷的实际检测能力。试验结果表明,显微CT在体素尺寸5 μm下能有效检出尺寸为20 μm的人工缺陷；金相检测与CT检测结果基本一致,缺陷尺寸测量差小于10 μm；由于部分体积效应的影响,更小尺寸缺陷的尺寸测量结果误差更大。
Abstract:In this paper, two groups of different types of defective specimens were designed and manufactured through high-precision metal additive manufacturing technology. Based on the micro-CT detection technology and the defect anatomical metallographic detection method, the actual detection ability of micro-CT on small defects of additive manufacturing was studied. The research results showed that micro-CT can effectively detect the artificial defects of 20 μm under the voxel size of 5 μm; metallographic detection and CT detection results were basically the same, and the difference in the measurement of the defect size was less than 10 μm; the defects of smaller sizes were more inaccurate due to the influence of the partial volume effect of the dimensional measurement results.
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Keywords:
- additive manufacturing /
- micro-CT /
- defect detection /
- dimensional measurement
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Table 1 体积型缺陷CT检测结果灰度测量与统计值
缺陷直径/μm 材料灰度值 缺陷灰度值 对比度 噪声 信噪比 尺寸测量值/μm 20 44 976 26 500 41 % 2 437 18 30 50 44 567 25 431 43 % 2 572 17 45 100 45 307 23 247 49 % 2 457 18 100 200 43 894 22 022 50 % 2 493 18 200 400 44 363 23 650 47 % 2 478 18 400 
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Table 2 裂纹缺陷CT检测结果灰度测量与统计值
缺陷宽度/μm 材料灰度值 缺陷灰度值 对比度 噪声 信噪比 尺寸测量值/μm 20 37 883 21 222 44 % 1 192 32 28 50 37 200 22 483 40 % 1 142 33 45 100 37 940 21 180 44 % 1 139 33 100 200 38 496 20 286 47 % 1 151 33 200 400 37 430 19 479 48 % 1 070 35 400
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Table 3 不同检测方式对不同类型缺陷的尺寸测量值
缺陷类型 检测方式 缺陷尺寸 体积型缺陷 金相检测 23 47 100 200 400 CT检测 30 45 100 200 400 裂纹缺陷 金相检测 24 48 100 200 400 CT检测 28 45 100 200 400
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