高温铸锻件内部温度场电磁超声重构方法研究  

An electromagnetic ultrasonic reconstruction method for internal temperature field of high temperature casting and forging

作　　者：石文泽[1,2] 童艳山 卢超 陈尧[1] 朱颖 Shi Wenze;Tong Yanshan;Lu Chao;Chen Yao;Zhu Ying(Key Laboratory of Nondestructive Testing,Ministry of Education,Nanchang Hangkong University,Nanchang 330063,China;State Key Laboratory of Acoustics,Chinese Academy of Sciences,Beijing 100190,China;Key Laboratory of Simulation and Numerical Modeling Technology of Jiangxi Province,Gannan Normal University,Ganzhou 341000,China)

机构地区：[1]南昌航空大学无损检测教育部重点实验室,南昌330063 [2]中科院声学研究所声场声信息国家重点实验室,北京100190 [3]赣南师范大学江西省数值模拟与仿真技术重点实验室,赣州341000

出　　处：《仪器仪表学报》2021年第8期218-229,共12页Chinese Journal of Scientific Instrument

基　　金：国家自然科学基金(52065049,12064001,51705231,51705232);江西省自然科学基金(20192ACBL20052);江西省科技厅科技计划项目(20204BCJL22039,20192BCD40028);江西省青年科学基金(20181BAB216020)项目资助。

摘　　要：针对高温严苛条件下铸锻件内部温度场非接触测量困难这一问题,提出了基于弯曲效应和三角形前向展开法的高温铸锻件温度场非接触电磁超声斜入射横波重构方法。结合数值仿真和730℃电磁超声检测实验,对直入射横波的三角形追踪数学模型进行了验证,并研究了声束入射角、温度梯度对斜入射横波的传播路径和渡越时间的影响,比较了不同入射角的斜入射横波的温度灵敏度系数。结果表明:基于三角形前向展开法的高温锻件温度场直入射横波重建误差在3%以内。当采用斜入射横波时,声线传播路径受温度梯度、入射角度的影响较大,且对温度梯度的变化更加敏感,无论使用横波渡越时间还是横波出射点位置偏移量均可重构高温铸锻件的内部温度场。Aiming at the difficulty of non-contact measurement of the casting and forging′s internal temperature field under high temperatures and severe conditions,a reconstruction method for the temperature field of high-temperature castings and forgings with non-contact oblique incident shear wave(S-wave)electromagnetic acoustic transducer(EMAT)based on the bending effect and the triangular forward expansion method is proposed.Combining the numerical simulations and EMAT testing experiments at 730℃,the triangle tracking mathematical model of direct incident S-waves is evaluated.The effects of sound beam incident angle and temperature gradient on the propagation path and flight time of oblique incident S-wave are studied,and the temperature sensitivity coefficients of oblique incident S-wave with different incident angles are compared.Results show that the reconstruction error of direct incident S-waves in the temperature field of the high-temperature forging based on the triangular forward expansion method is within 3%.When the oblique incident S-wave is used,the propagation path of sound ray is greatly affected by the temperature gradient and the incidence angle,and it is more sensitive to the change of temperature gradient.The internal temperature field of high-temperature casting can be reconstructed by the flight time of the S-wave and the offset of the exit point of the S-wave.

关 键 词：高温铸锻件 温度场重建 三角形前向展开法 电磁超声换能器 斜入射超声波 

分 类 号：TP312[自动化与计算机技术—计算机软件与理论] TH878[自动化与计算机技术—计算机科学与技术]