Quantitative Influence of Radiation Direction on Detection Sensitivity of Pore Defect by Additive Manufacturing
Comparative specimens of GH3625 superalloy were manufactured by laser selective melting technology,and eight pore defects were prefabricated in the interior.The influence of different radiation directions on detection sen-sitivity of internal pore defects was investigated.The location,morphology,and size of internal pores were obtained using 225 kV micro-CT,and results indicate that sizes of all pore are larger than the designed ones.The No.2 pore was extracted and a 3D model in STL format was exported,and a new defect detection model was constructed com-bined with the sample model.CIVA software was utilized to simulate the X-ray DR imaging under different radiation directions,and contrast-to-noise ratio of pore defects under different radiation directions was analyzed to quantitatively evaluate the effect of radiation direction on detection sensitivity of pore defect.The results reveal that various CNR val-ues of No.2 pores are obtained along different radiation directions,reaching the maximum at 10° and the lowest at 230°,indicating the significant impact of radiation direction on detection sensitivity of pore defect.
Additive ManufacturingPoreMicro Computed TomographyContrast-to-noise Ratio
NETL
NSTL
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