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以TC4钛合金激光立体成形件为研究对象,探讨其内部、表面及近表面孔洞类缺陷与超声波的相互作用关系。研究结果表明,在相同检测条件下,对于TC4钛合金激光立体成形件中同深度不同孔径的长横孔缺陷,超声反射波幅值随长横孔直径的增加而增加;对于成形件中同孔径不同深度的长横孔缺陷,超声反射波幅值随长横孔所在深度增加而减小;利用5PФ8纵波直探头,能发现激光立体成形TC4钛合金中0.6 mm大小的孔洞类缺陷;超声表面波沿深度方向发现TC4钛合金激光立体成形件中槽型和孔型缺陷的能力均小于4 mm,且孔型缺陷比槽型缺陷更难发现。
The TC4 titanium alloy laser three-dimensional shaped parts were taken as the research object to study the internal, surface and near-surface hole defects and ultrasonic interaction. The results show that under the same test conditions, the amplitude of the ultrasonic reflection wave increases with the increase of the diameter of the long transverse hole in the TC4 titanium alloy laser three-dimensionally formed long transverse hole defect with the same depth and different aperture. For the same aperture Longitudinal transverse hole defects of different depths and the amplitude of the ultrasonic reflection wave decrease with the increase of the depth of the long transverse hole. Using the 5PФ8 longitudinal wave straight probe, the hole defects of 0.6 mm in the laser three-dimensional forming TC4 titanium alloy can be found. The ultrasonic surface wave The ability of groove and hole defects in TC4 titanium alloy laser three-dimensional shaped parts to be found in the depth direction is less than 4 mm, and the hole defects are harder to find than the groove defects.