In this research, properties of ultrasonic waves transmitted in some carbon steels were investigated. Base on ultrasonic measurements for the steel samples of X40H, S45, SCM420, and SCR420, the values of ultrasonic wave velocities including longitudinal and transverse velocities were determined. These measurements also used to obtain ultrasonic attenuations of these steel samples. Based on ultrasonic velocities, the mechanical properties of these steel samples were calculated including Poisson’s Ratio υ, Young’s modulus E, and Shear modulus G. The experimental results show that these mechanical parameters were linearly depended on the carbon steel samples’ temperature. | VNU Journal of Science: Mathematics – Physics, Vol. 33, No. 2 (2017) 66-73 Temperature Dependence of Ultrasonic Waves Properties Propagated in Some Types of Carbon Steels Luong Thi Minh Thuy1,*, Pham Van Thanh1, Nguyen Xuan Tuyen1, Nguyen Duc Anh1, Nguyen Thi Ha Thu2 1 Faculty of Physics, VNU University of Science, 334 Nguyen Trai, Hanoi, Vietnam 2 Air Defence - Air Force Academy, Kim Son, Son Tay, Hanoi, Vietnam Received 17 April 2017 Revised 22 May 2017; Accepted 15 June 2017 Abstract: In this research, properties of ultrasonic waves transmitted in some carbon steels were investigated. Base on ultrasonic measurements for the steel samples of X40H, S45, SCM420, and SCR420, the values of ultrasonic wave velocities including longitudinal and transverse velocities were determined. These measurements also used to obtain ultrasonic attenuations of these steel samples. Based on ultrasonic velocities, the mechanical properties of these steel samples were calculated including Poisson’s Ratio υ, Young’s modulus E, and Shear modulus G. The experimental results show that these mechanical parameters were linearly depended on the carbon steel samples’ temperature. Keywords: Carbon steels, Ultrasonic Velocity, Ultrasonic Attenuation, Mechanical Characteristics. 1. Introduction Non-destructive testing (NDT) is a group of analysis method to evaluate properties of materials, components, or system without causing damage of test sample. Especially, they are widely used to check the defects inside components. If a defect appears, its location, dimension and shape could be determined by NDTs. Up to date, there are several techniques of NDTs, such as X-ray images [1], thermographic imaging [2], the ultrasonic testing method [3], etc. Among these techniques, the ultrasonic testing method is widely utilized due to its advantages such as low-cost, high accuracy, short time, and high safety. Today, carbon steels are used in many fields, especially in the field of industrial .
