金属材料内部非金属夹杂超声检测的数值模拟  

Numerical simulation of ultrasonic testing for non-metallic inclusions in metallic materials

作　　者：陈丹[1] 肖会芳[2] 黎敏[1] 王善超[1] 徐金梧[1] 

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学国家板带生产先进装备工程技术研究中心,北京100083

出　　处：《工程科学学报》2015年第7期942-949,共8页Chinese Journal of Engineering

基　　金：'十二五'国家科技支撑计划资助项目(2012BAF04B02);北京高等学校青年英才计划资助项目(YETP0373)

摘　　要：在金属材料内部夹杂物的超声检测中,如何通过检测获得的回波信号辨识夹杂物的属性和位置,一直是其重点和难点问题.通过建立包含夹杂物缺陷的二维金属板模型,采用有限元数值模拟的方法,对材料内部超声波场进行计算,获得了两种最典型的夹杂物Al2O3和Ti N,以及二者在材料内部不同深度时的超声回波信号.研究了夹杂物类型和夹杂物深度对超声回波时域波形以及对界面波、夹杂物缺陷回波和底面回波频谱分布的影响规律.In the area of internal inclusion detection using ultrasonic,identifying the location and type of internal inclusions using the collected back echo signals has always been a difficult problem. A two-dimensional metallic plate containing inclusions is established. Ultrasonic wave fields inside this material are calculated by the finite element method. Echo waves for two typical inclusions of Al2O3 and Ti N and for these inclusions with different depths are obtained. The influences of the type and depth of inclusions on the time-domain and the spectral distribution of interfacial waves,echo waves of inclusions and bottom echo waves are analyzed especially.

关 键 词：金属材料 非金属夹杂物 超声检测 数值模拟 频谱分析 

分 类 号：TG115.285[金属学及工艺—物理冶金] G142.1[金属学及工艺—金属学]