射线透照方向对增材制造孔隙缺陷检测灵敏度定量影响  

Quantitative Influence of Radiation Direction on Detection Sensitivity of Pore Defect by Additive Manufacturing

作　　者：靖珍珠 辛旭晖 宋鸿玉 敖波[2] JING Zhenzhu;XIN Xuhui;SONG Hongyu;AO Bo(AECC Commercial Aircraft Engine Co.,Ltd.,Shanghai,201306;Key Laboratory of Nondestructive Test-ing Technology,Ministry of Education,Nanchang Hangkong University,Nanchang 330063)

机构地区：[1]中国航发商用航空发动机有限责任公司,上海201306 [2]南昌航空大学无损检测技术教育部重点实验室,南昌330063

出　　处：《特种铸造及有色合金》2024年第8期1104-1108,共5页Special Casting & Nonferrous Alloys

基　　金：国防基础科研项目(JCKY2019401D001)。

摘　　要：以激光选区熔化工艺制造GH3625高温合金为对比试样,内部预制了8个孔隙缺陷,研究不同射线透照方向对内部孔隙缺陷检测灵敏度的影响。采用225 kV显微CT技术获取内部孔隙的位置、形态及大小,结果显示所有孔隙尺寸都大于设计尺寸。提取2号孔隙并导出STL格式三维模型,结合试样模型构建新的缺陷检测模型,采用CIVA软件模拟不同透照方向下射线DR成像仿真,分析不同透照方向下孔隙缺陷的对比度噪声比(CNR)指标,从而定量评价透照方向对孔隙缺陷检测灵敏度的影响。结果表明,2号孔隙缺陷不同透照方向下的CNR不同,角度为10°时CNR值最大,而角度为230°时CNR值最小,透照方向对孔隙缺陷的检测灵敏度影响较大。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.

关 键 词：增材制造 孔隙 显微CT 对比度噪声比 

分 类 号：TG115.28[金属学及工艺—物理冶金]