钛合金缺陷相控阵超声衍射波定量方法

Quantitative Method of Phased Array Ultrasonic Diffraction Wave for Titanium Alloy Defects

针对传统衍射波设置法受散射杂波干扰难以进行钛合金缺陷定量的问题,分析了体积型缺陷和面积型缺陷的超声衍射波信号特点,并通过试验测试了钛合金材料的衍射波信号特征,提出了基于相控阵超声的高信噪比衍射波定量方案。制备了不同尺寸的长横孔试块和通槽试块,分别模拟体积型缺陷和面积型缺陷,测试试验定量。结果表明,采用相控阵超声衍射波定量方法对两种类型缺陷的定量精度均达到了1 mm以内。相控阵超声衍射波定量法操作简单,可为钛合金缺陷定量提供新的思路。

Aiming at the problem that the traditional diffraction wave setting method is difficult to quantify titanium alloy defects due to the interference of scattered clutter,the signal characteristics of ultrasonic diffraction wave in hole type defect and area type defect were analyzed,and the ultrasonic diffraction wave signal characteristics of titanium alloy were tested.A high signal-to-noise ratio diffraction wave quantification scheme based on phased array ultrasonic was proposed.Different sizes of long hole block and square groove block were prepared to simulate hole type defect and area type defect respectively.The quantitative results of the test showed that the quantitative accuracy of the two types of defect was less than 1 mm.The operation of phased array ultrasonic quantitative method based on diffraction wave is simple and a new idea is provided for the defect quantitative method of titanium alloy.