In order to solve the problem that it is difficult to measure the key mechanical parameters of GH600 nickel-based alloy in variable temperature environment, an ipsilateral detection method and opposite-side centering detection method based on the energy distribution characteristics of surface wave and longitudinal wave is proposed. By coupling the laser ultrasonic detection system with the high and low temperature devices made in the laboratory, the velocities of the surface wave and longitudinal wave are obtained, and the mechanical parameters of the alloy at -90~1 000 ℃ are theoretically deduced. The experimental results show that the elastic modulus and shear modulus decrease and the Poisson ratio increases with the increase of temperature, and the difference between the measured values and the reference values is small. The experiments validate that the laser ultrasonic system can effectively gauge the performance of components within challenging environments.
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