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Utilization of Ultrasonic Measurements to Quantify Aging-Induced Material Microstructure and Property Changes

Published online by Cambridge University Press:  21 February 2011

Steven R. Doctor ,
Stephen M. Bruemmer ,
Morris S. Good ,
Larry A. Charlot ,
T. Thomas Taylor ,
Donald M. Boyd ,
John D. Deffenbaugh  and
Larry D. Reid
Steven R. Doctor
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
Stephen M. Bruemmer
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
Morris S. Good
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
Larry A. Charlot
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
T. Thomas Taylor
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
Donald M. Boyd
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
John D. Deffenbaugh
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
Larry D. Reid
Affiliation:
Pacific Northwest Laboratory, P. 0. Box 999, Richland, WA 99352
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Abstract

Many structural components are exposed to thermal environments that promote aging-induced changes in material microstructure and properties. The extent of these changes may lead to a reduction in the design safety factors and, as a worst case, premature failure of the component. In order to illustrate how nondestructive measurements can be used to indicate these changes, ultrasonic measurements were conducted on stainless steel. Specimens from a high-carbon, Type 304 stainless steel were subjected to various thermal treatments to introduce differing precipitation morphologies. Specimens were examined using transmission electron microscopy to quantify the size, density, and distribution of the precipitates formed. Ultrasonic measurements were performed to assess sensitivity to the change in precipitation levels. Shear-wave birefringence provided the most consistent measurements for tracking precipitate morphology changes. Birefringence velocity differences increased as precipitate size and density increased on grain boundaries and as additional precipitates formed in the matrix. The ability to nondestructively monitor the precipitation process is important since susceptibility to environmentally assisted cracking and low-temperature embrittlement correlated with this microstructural change.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 142: Symposium U – Nondestructive Monitoring of Materials Properties , 1988 , 143
Copyright
Copyright © Materials Research Society 1989

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