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Nonlinear Ultrasonic Parameter in Precipitate-Hardened Steels

Published

Author(s)

Donna C. Hurley, Davor Balzar, P T. Purtscher

Abstract

We have investigated several specimens of ASTM A710 steel containing copper-rich precipates with variations in the final aging treatment. X-ray diffraction line-broadening and small-angle neutron-scattering experiments revealed the existence of the precipitates and associated coherency strain. We determined the nonlinear ultrasonic parameter Β for each specimen by harmonic- generation experiments and measured the ultrasonic longitudinal velocity ŅL and attenuation αL. Although ŅL and αL showed no consistent trends, Β increased with increasing strain. This correlation is compared to a microstructural model for harmonic generation that includes a contribution from precipitate-pinned dislocations.
Conference Dates
November 29-30, 1999
Conference Title
Nondestructive Characterization of Materials

Keywords

elastic properties, nonlinear acoustics, precipitation hardening, ultrasonics

Citation

Hurley, D. , Balzar, D. and Purtscher, P. (1999), Nonlinear Ultrasonic Parameter in Precipitate-Hardened Steels, Nondestructive Characterization of Materials (Accessed April 22, 2024)
Created November 1, 1999, Updated February 17, 2017