钢中非金属夹杂物对时频域超声参量的影响  

Effect of embedded inclusion in steel on ultrasonic parameters in time frequency domain

作　　者：肖会芳 陈丹 徐金梧 XIAO Huifang;CHEN Dan;XU Jinwu(School of Mechanical Engineering,University of Science and Technology Beijing,Beijing 100083,China;Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学机械工程学院,北京100083 [2]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《中南大学学报（自然科学版）》2018年第10期2381-2390,共10页Journal of Central South University:Science and Technology

基　　金：国家"十二五"科技支撑计划项目(2015BAF30B00);国家自然科学基金资助项目(51775037)~~

摘　　要：通过建立包含夹杂物的二维金属板超声测量数值分析模型,研究超声信号随夹杂物的深度、厚度和类型等属性特征的变化规律,并通过超声显微镜和扫描电镜实验验证模型的有效性。研究结果表明:纵波声速随夹杂物厚度的增加呈线性递增,含有Al2O3夹杂物的声速最大且增速最快,含有MnS夹杂物的声速最小且增速最慢,纵波声速可以作为判定内部是否存在夹杂物的参量;不同超声参量随入射波长的变化关系曲线,可用于判定夹杂物的厚度;当夹杂物深度位于钢板厚度的中间时,衰减系数最大,且含有MnS夹杂物引起的声波幅值衰减最严重,含有TiN夹杂物的声波幅值衰减最小。A numerical analytical model of two-dimensional isotropic plate with embedded inclusion was established,and the variation of ultrasonic signals with the depth,thickness and type of inclusions was studied.The validity of the model was verified using experimental results from ultrasonic microscope measurement and scanning electron microscope.The results show that the longitude sound velocity increases linearly with the thickness of inclusion.The Al2O3 inclusion has the largest sound velocity and the fastest increasing rate,while the sound velocity of MnS inclusion has the smallest sound velocity and the slowest rising rate.The longitudinal sound velocity can be used to determine the existence of inclusion.The relationship between different ultrasonic parameters and incident wavelength can be used to determine the thickness of inclusions.When the inclusion is at the center of the steel plate,the attenuation coefficient has the maximum value,and the attenuation of MnS inclusion is the maximum,while the attenuation of TiN inclusion is the minimum.

关 键 词：非金属夹杂物 超声参量 数值仿真 多值域 影响特性 

分 类 号：TH14[一般工业技术—材料科学与工程]