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In this paper, the dependences of the velocities and the absorption coefficients of ultrasonic waves transmitted in 1018 low carbon steel on temperature ranging from 0˚C to 50˚C were investigated. It was shown that the velocities of the ultrasonic longitudinal wave and ultrasonic shear wave were decreased when the temperature increased. | Communications in Physics, Vol. 24, No. 3S1 (2014), pp. 1-6 DOI:10.15625/0868-3166/24/3S1/5070 NON-DESTRUCTIVE CHARACTERISTICS OF ULTRASONIC WAVES IN 1018 LOW CARBON STEEL DO TRUNG KIEN, PHAM THI TUYET NHUNG, PHAM VAN THANH Faculty of Physics, University of Science, Vietnam National University, Hanoi E-mail: phamvanthanh@hus.edu.vn Received 20 June 2014 Accepted for publication 20 August 2014 Abstract. In this paper, the dependences of the velocities and the absorption coefficients of ultrasonic waves transmitted in 1018 low carbon steel on temperature ranging from 0˚C to 50˚C were investigated. It was shown that the velocities of the ultrasonic longitudinal wave and ultrasonic shear wave were decreased when the temperature increased. The transportation of the ultrasonic longitudinal wave and ultrasonic shear wave depends on temperature and its coefficient in a temperature range of (0 – 50 ˚C) was estimated about 0.8 m/s.˚C and 0.44 m/s.˚C, respectively. These obtained results are in good agreement with the theoretical prediction. Furthermore, the absorption coefficients of the ultrasonic longitudinal wave were also studied. Keywords: ultrasonic, nondestructive testing, longitudinal wave, shear wave, ultrasonic velocity, attenuation, low carbon steel. I. INTRODUCTION Non-destructive testing methods are very popularly used to evaluate the properties of materials, components or systems without damages. The most common application is checking of defects. When the defects are detected, their location, dimension, orientation, and shape are required to determine. Other important characteristics are also required by using the nondestructive testing methods, such as micro-structural and mechanical properties. There are several non-destructive techniques, such as X-ray images [1], thermographic imaging [2], ultrasonic testing methods [3], etc. . . . In these methods, the ultrasonic testing method is widely used to analyze and characterize the properties of materials .
