激光选区熔化成形件射线检测及缺陷尺寸评价技术研究  

Research on Radiography Testing and Defect Size Evaluation of Selective Laser Melting Parts

作　　者：王文强 危荃[1] 宋鸿玉 王飞[1] 周鹏飞[1] 金翠娥[1] 高显亮 熊凤军 WANG Wen-qiang;WEI Quan;SONG Hong-yu;WANG Fei;ZHOU Peng-fei;JIN Cui-e;GAO Xian-liang;XIONG Feng-jun(Shanghai Spaceflight Precision Machinery Institute,Shanghai 201600,China;Key Laboratory of Nondestructive Testing Technology(Ministry of Education),Nanchang Hangkong University,Nanchang 330063,China;Beijing Aircraft Maintenance Engineering Co.,Ltd.Chengdu Branch,Chengdu 610299,China)

机构地区：[1]上海航天精密机械研究所,上海201600 [2]无损检测技术教育部重点实验室(南昌航空大学),南昌330063 [3]北京飞机维修工程有限公司成都分公司,成都610299

出　　处：《失效分析与预防》2022年第3期162-168,共7页Failure Analysis and Prevention

基　　金：国防基础科研项目(JCKY2019401D001)。

摘　　要：针对TC4激光选区熔化成形件内部缺陷射线检测及定量尺寸评价,通过CR检测方法研究TC4人工缺陷(气孔、熔合不良)试样射线检测灵敏度及最小缺陷可检能力,利用显微CT定量分析缺陷尺寸、三维形貌及空间分布,并对比两种成像方法对于缺陷尺寸计量的差异。结果表明:CR检测方法能够检出ϕ0.4 mm的模拟气孔、ϕ0.8 mm×0.3 mm熔合不良缺陷,而显微CT具有更高的检测灵敏度,适用于微小气孔的缺陷检测、尺寸评价及定量分析,可检出ϕ0.3 mm的模拟气孔缺陷;人工缺陷设计/实物尺寸偏差范围≤10%,并且随着缺陷设计尺寸的增大,缺陷实际打印三维形貌越不规则。The internal defects formed in TC4 specimen manufactured by selective laser melting were determined by employing radiographic testing with their sizes quantitatively evaluated.With the computed radiography(CR),the radiographic detection sensitivity and minimum defect detectability of the artifical defects such as porosity amd poor fusion in TC4 specimen were studied.It is employed computed tomography(CT)to quantitatively analyze the defect sizes,corresponding three-dimensional morphology and spatial distribution.Comparing the detection difference between the two imaging methods reaches the following results.The CR test method can detect the simulated pore ofϕ0.4 mm and fusion defects withϕ0.8 mm×0.3 mm in size.The CT method demonstrates higher detection sensitivity,which is suitable for defect detection,size evaluation and quantitative analysis of tiny pores such as the simulated pores ofϕ0.3 mm.The deviation between the sizes of artificial defect and actual object is within 10%.Moreover,the actual three-dimensional shape of the printed defects becomes more irregular with increased defect size.

关 键 词：激光选区熔化 显微CT 射线检测 缺陷尺寸 

分 类 号：TG115.28[金属学及工艺—物理冶金]