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2020
Journal Article
Titel
Direct measurements of Rayleigh wave acoustoelastic constants for shot-peened superalloys
Abstract
In this article the experimental investigation of surface wave (Rayleigh wave) acoustoelastic constants (AEC) dependency on treatment parameters and plastic deformation is discussed. These constants are demanded for the monitoring of surface treatment intensity with means of ultrasonic testing. The indirect (mapping of bulk wave AEC to the surface wave AEC through the Grüneisen constants) and the direct method are compared for the different states of material (annealed, plastically deformed, surface treated) for the In718 and Ti6246 alloys. It is shown that surface AEC are very sensitive to any changes in material structure up to change in the sign of the effect, and for the practical application the direct in-situ Rayleigh wave AEC measurement should be performed.