基于PECT-EMAT复合检测方法的铁磁性材料的复合缺陷检测  

Composite defects detection of ferro magnetic material based on PECT-EMAT hybrid testing method

作　　者：李鹏[1,3] 赵瑞祥 段志荣 解社娟 王恪典[1] LI Peng;ZHAO Ruixiang;DUAN Zhirong;XIE Shejuan;WANG Kedian(College of Mechanical Engineering,Xinjiang University,830000 Urumqi,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Shaanxi Engineering Research Center of Nondestructive Testing and Structural Integrity Evaluation,Xi’an Jiaotong University,710049 Xi’an,China;Xinjiang Uygur Autonomous Region SpecialEquipment Inspection and Research Institute,830011 Urumqi,China)

机构地区：[1]新疆大学机械工程学院,乌鲁木齐830000 [2]西安交通大学航天航空学院,机械结构强度与振动国家重点实验室,陕西省无损检测与结构完整性评价工程技术研究中心,西安710049 [3]新疆维吾尔自治区特种设备检验研究院,乌鲁木齐830011

出　　处：《应用力学学报》2023年第4期814-823,共10页Chinese Journal of Applied Mechanics

基　　金：国家自然科学基金资助项目(NSFC No.12222207);国家自然科学基金资助项目(NSAF No.U2130206);新疆维吾尔自治区科技援疆资助项目(No.2019E0239)。

摘　　要：铁磁性材料在现代能源工业设备关键结构上广泛应用。一些关键部位由于生产、使用时产生的拉应力状态及环境影响,易萌生表面应力腐蚀裂纹,同时在弯管或焊缝处经长期冲蚀也可能出现内部局部减薄缺陷,对工业设备结构的安全可靠性构成了严重的威胁。本研究提出并开发了基于脉冲涡流-电磁超声复合电磁无损检测方法来检测铁磁性试件的表面裂纹和底部减薄缺陷。并开发了基于频谱滤波的信号分离方法,成功提取出复合检测中的脉冲涡流信号和电磁超声信号。实验结果表明,其中脉冲涡流信号可以有效检测试件的表面裂纹,电磁超声信号可以很好地定量试件底部减薄缺陷的残余厚度。由此可见,本研究开发的新型方法可以同时检测试件上下表面两种类型的缺陷,具有明显的优势。Ferromagnetic materials are widely used in the structures of modern energy industrial equipment.Some key parts easily form surface stress corrosion crack because of the tensile stress produced in the process of production and service.At the same time,internal thinning defects in the bending pipe also easily appear due to the fluid corrosion.These defects will seriously threaten the safety and reliability of industrial equipment structures.A composite electromagnetic nondestructive testing method based on pulsed eddy current and electromagnetic ultrasonic is proposed and developed to detect the surface cracks and bottom thinning defects of ferromagnetic specimens in this study.Meanwhile,a signal separation method based on spectrum filtering is developed to extract the pulsed eddy current signal and electromagnetic ultrasonic signal in composite detection.The experimental results show that the pulsed eddy current signal can effectively detect the surface cracks and the electromagnetic ultrasonic signal can well quantify the residual thickness of the bottom thinning defects.Therefore,the novel method developed in this study is of obvious advantages because it can detect both surface defects and bottom defects at the same time.

关 键 词：PECT-EMAT复合检测 铁磁性材料 复合缺陷 

分 类 号：TG115.2[金属学及工艺—物理冶金]