[1]彭笑永,李大磊,邹云,等.激光超声无损测量40Cr钢渗氮层深度的实验研究[J].郑州大学学报(工学版),2020,41(06):7-12.
 Experimental Investigation on Non-destructive Measuring the Nitriding Thickness of 40Cr Steel by Laser Ultrasonic[J].Journal of Zhengzhou University (Engineering Science),2020,41(06):7-12.
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激光超声无损测量40Cr钢渗氮层深度的实验研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
41
期数:
2020年06期
页码:
7-12
栏目:
出版日期:
2020-12-31

文章信息/Info

Title:
Experimental Investigation on Non-destructive Measuring the Nitriding Thickness of 40Cr Steel by Laser Ultrasonic
作者:
彭笑永李大磊邹云卢金生李阳
文献标志码:
A
摘要:
现有的硬度法和金相法无法满足40Cr钢渗氮层深度的无损检测需求.本文提出利用激光超声技术得到表面波的频散特性,进而实现渗氮层深度的无损测量.首先,利用脉冲激光在不同渗层深度的40Cr钢表面激励出表面波,通过激光干涉仪接收表面波,从而实现表面波信号的非接触激励和接收;然后,采用二维傅里叶变换(2D-FFT)方法提取出表面波的频散曲线.实验结果表明:随着渗层深度的增加,表面波的相速度也随着增加;表面波在低频时有较大的频散特性,而在高频范围内表面波的传播速度变化较小;当渗氮层深度达到400 μm时,表面波速度的变化趋势不明显;表面波的传播速度和渗氮层深度有一定的对应关系,通过测量表面波的传播速度可近似得到渗氮层的深度.因此,激光超声技术是一种潜在的40Cr钢渗氮层深度的无损测量方法,具有一定的工程应用价值.
Abstract:
The nitriding thickness of 40Cr steel cannot be non-destructively measured by means of metalloscopy and microhardness method. Therefore, a laser ultrasonic measurement was proposed to measure the nitriding thickness non-de structively through the dispersion of surface waves. Firstly, the surface waves were excited on the 40Cr steel s with different nitriding thickness, and then the surface waves were received by laser interferometer. So the signals of surface waves were excited and received contactless. Finally, the disperse curves of surface waves were extracted by 2D-FFT. It was found that the phase velocity of surface waves increase as the nitriding thickness increase. The dispersion of surface waves with low frequencies is higher than that with high frequencies. The velocity of surface waves do not change when the intriding thickness is higher than 400 μm. A relationship between the velocity of surface waves and the nitriding thickness, can be used to measure the nitriding thickness. Therefore, the laser ultrasonic is a feasible method to measure the nitriding thickness of 40Cr steel non-destructively, and it has a value in engineering applications.
更新日期/Last Update: 2021-02-10