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Nonlinear ultrasonic assessment of precipitation hardening in ASTM A710 steel

Published online by Cambridge University Press:  31 January 2011

D. C. Hurley ,
D. Balzar  and
P. T. Purtscher
D. C. Hurley
Affiliation:
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80303
D. Balzar
Affiliation:
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80303
P. T. Purtscher
Affiliation:
National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80303
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Abstract

We 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 vL and attenuation αL. Although vL and aL 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-inned dislocations.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 9 , September 2000 , pp. 2036 - 2042
Copyright
Copyright © Materials Research Society 2000

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