Laser Ultrasonic Evaluation of Metallic Material Thickness at High Temperature

doi:10.3901/JME.2021.10.021

Abstract

Abstract: In order to solve the problem of thickness measurement of metal materials under high temperature conditions, laser ultrasonic technique is used to firstly obtain the propagating time of the longitudinal wave pulse signal reflected from the bottom surface of the sample when scanning the excitation light source and fixing the detection source. The sample thickness and bulk longitudinal wave velocity were then obtained accordingly. Afterwards, the thickness measurement of multiple No. 20 alloy steel samples was realized in the temperature range from room temperature to 480 ℃. The multi-sample measurement results with multiple temperatures and different thicknesses show that the relative thickness error of this method is less than 1.5% (sample thickness >10 mm), so that the test results are reliable. The difference between this thickness measurement method and the conventional pulsed-echo method is that this method does not depend on the measurement of the longitudinal wave velocity, so there is no need to take into consideration the change in sound velocity caused by the increase in material temperature. The research results can provide new solutions and theoretical support for non-contact high-precision measurement of material thickness at high temperatures.

Key words: laser ultrasonic testing, high temperature, thickness measurement

CLC Number:

TG115

ZHENG Kai, WU Xing, LI Junyan, NI Chenyin, SHEN Zhonghua, MA Xiangdong, YU Yanping, HE Junhua. Laser Ultrasonic Evaluation of Metallic Material Thickness at High Temperature[J]. Journal of Mechanical Engineering, 2021, 57(10): 21-27.

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