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Nonlinear Ultrasonic Parameter in Precipitate-Hardened Steels

Published online by Cambridge University Press:  10 February 2011

D. C. Hurley ,
D. Balzar  and
P. T. Purtscher
D. C. Hurley
Affiliation:
National Institute of Standards & Technology, Boulder, CO 80303, [email protected]
D. Balzar
Affiliation:
National Institute of Standards & Technology, Boulder, CO 80303, [email protected] Dept. of Physics, University of Colorado, Boulder, CO 80309
P. T. Purtscher
Affiliation:
National Institute of Standards & Technology, Boulder, CO 80303, [email protected] Portsmouth Naval Shipyards, Portsmouth, NH 03801
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Abstract

We have investigated several specimens of ASTM A710 steel containing copper-rich precipitates 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 νL and attenuation αL. Although νL 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.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 591 , 1999 , 129
Copyright
Copyright © Materials Research Society 2000

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Footnotes

*

Contribution of NIST, an agency of the US government; not subject to copyright.

References

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