Nonlinear ultrasonic detection system and detection method for reflective metal creep performance

Abstract

The invention relates to a nonlinear ultrasonic detection system and a detection method for a reflective metal creep performance. The nonlinear ultrasonic detection system for the metal creep propertytransmits and receives ultrasonic detection signals through an ultrasonic transducer, and extracts high-order harmonic signals and fundamental wave signals separately by separating the received detection signals, so as to obtain the nonlinear ultrasonic parameters for evaluating the metal creep property. Since the detection system uses only one ultrasonic transducer, the problem that two ultrasonic transducers are difficult to be located in a coaxial position due to the use of two ultrasonic transducers for the detection is avoided in practical applications. The nonlinear ultrasonic detectionmethod based on the detection system has high accuracy and good applicability in the field application of the metal creep.

Description

technical field [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to a nonlinear ultrasonic testing system and method for metal creep performance. Background technique [0002] Creep refers to the process of slow plastic deformation of materials. This phenomenon continues to affect the entire service period of metal components. damage cannot be ignored. Today, with the rapid development of industry, in many fields such as energy power, petrochemical industry, aerospace, etc., many metal components will inevitably have creep damage phenomenon when they serve for a long time under high temperature and high pressure conditions. This creep phenomenon restricts The operation of equipment also threatens the safety of equipment, which makes the influence of creep cannot be ignored in the production process, and it is extremely important to evaluate the creep state of equipment and predict the remaining life of materials. [0...

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Problems solved by technology

Ultrasonic nonlinear parameters are used as a parameter to characterize the creep state of metal materials. This parameter is usually obtained by the penetration method. For details, see "Nonlinear Ultrasonic Evaluation of Creep Damage of Steam Turbine Rotor Steel" (Zhang Meng, Xuan Fuzhen, "Mechanical Engineering Journal", Volume 52 No. 2, January 2016), the penetration method is to use a low-frequency transmitting probe to transmit detection signals and receive detection signals through a high-frequency receiving transducer. This method needs to keep transmitting and receiving The ultrasonic transducer is in the coaxial position, and the upper and lower surfaces of the detection parts where the transmitting and receiving transducers are located must be smooth and flat. When testing large workpieces, it is difficult to ensure that the transmitting and receiving ultrasonic transducers are coaxial At the same time, the inner surface of the measured component is sometimes difficult to access due to the influence of the working environment during on-site inspection (for example, the inner wall of chemical equipment is not easy to clean and polish the surface due to the narrow space or corrosive environment), so the penetration method Applications are limited

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