期刊
MEASUREMENT
卷 118, 期 -, 页码 105-112出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.measurement.2018.01.020
关键词
Ultrasonic testing; Selective laser melting; Ultrasonic scattering measurement; Structural noise; Extreme value statistics
资金
- National Natural Science Foundation of China [51575541, 51711530231]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B051]
- fund of State Key Laboratory of Powder Metallurgy, Central South University
To improve ultrasonic testing capability for additively manufactured materials, extreme value statistics is employed to calculate the experimental confidence bounds of structural noise, which can be treated as time-dependent thresholds for ultrasonic C-scan image segmentation. A 316L stainless steel sample manufactured by selective laser melting is used for ultrasonic scattering measurements with a focused transducer. Compared with the fixed threshold used in the traditional C-scan image segmentation, the time-dependent threshold can effectively distinguish the flaw echoes from the background of structural noise. The optical microscopy measurement results show that the present method can avoid both missed detections and false positives.
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