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“Real-World” Microscopy: Understanding Environment-Sensitive Behavior of Ni-Base Welds

Published online by Cambridge University Press:  02 July 2020

M. G. Burke ,
R. J. Wehrer  and
C.M. Brown
M. G. Burke
Affiliation:
Bettis Atomic Power Laboratory, Westinghouse Electric Company, West Mifflin, PA15122
R. J. Wehrer
Affiliation:
Bettis Atomic Power Laboratory, Westinghouse Electric Company, West Mifflin, PA15122
C.M. Brown
Affiliation:
Bettis Atomic Power Laboratory, Westinghouse Electric Company, West Mifflin, PA15122
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Extract

Ni-base alloy welds such as EN82H weld metal are frequently employed in nuclear power applications where resistance to corrosion is required. Results of a recently reported study of the mechanical properties of EN82H welds show that this alloy is susceptible to low-temperature (∼100°C) environmental embrittlement (LTEE) in hydrogenated water. LTEE is a manifestation of hydrogen embrittlement in these alloys.1 Recent LTEE tests have demonstrated a beneficial effect of a high-temperature (∼1100°C) anneal and furnace-cool in alleviating the material's susceptibility to LTEE. Understanding the reason for the reduction in LTEE susceptibility requires detailed characterization of the microstructure so that the specific structural and compositional changes that have been induced by the solution-anneal can be identified. This study reports the results of light optical and analytical electron microscopy (AEM) characterization of the microstructures of as-fabricated and as-solution-annealed EN82H welds with the objective of providing insight into the observed LTEE behavior.

Type
Microscopy and Microanalysis in the “Real World”
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 528 - 529
Copyright
Copyright © Microscopy Society of America

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References

References:

1.Brown, C.M. and Mills, W.J., CORROSION/96 Paper No. 90 (Houston TX, NACE International, 1996)Google Scholar
2. The authors thank Dr. D.M. Symons for valuable technical discussions.Google Scholar