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Influence of Thermal Aging on the Mechanical and Corrosion Properties of GTAW Welds of Alloy N06022

Published online by Cambridge University Press:  21 March 2011

Tammy S. Edgecumbe Summers ,
Raúl B. Rebak ,
Todd A. Palmer  and
Paul Crook
Tammy S. Edgecumbe Summers
Affiliation:
Lawrence Livermore National Laboratory 7000 East Ave, Livermore, CA 94550
Raúl B. Rebak
Affiliation:
Lawrence Livermore National Laboratory 7000 East Ave, Livermore, CA 94550
Todd A. Palmer
Affiliation:
Lawrence Livermore National Laboratory 7000 East Ave, Livermore, CA 94550
Paul Crook
Affiliation:
Haynes International, Inc. 1020 W. Park Ave., Kokomo, IN 46904
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Abstract

The phase stability of C-22 alloy (UNS N06022) gas tungsten arc welds was studied by aging samples at 593, 649, 704, and 760°C for times up to 6,000 hours. The tensile properties and the Charpy impact toughness of these samples were measured in the as-welded condition as well as after aging. The corrosion resistance was measured using standard immersion tests in acidic ferric sulfate (ASTM G 28 A) and 2.5% hydrochloric acid solutions at the boiling point. The microstructures of weld samples were examined using scanning electron microscopy (SEM). Precipitate volume fraction measurements were made using optical microscopy.

Degradation of the mechanical and corrosion properties of C-22 welds due to aging at all temperatures investigated was seen to occur sooner than was seen in C-22 base metal. An evaluation of the kinetics of nucleation and growth of the precipitates forming at these temperatures, however, indicated that no significant changes in TCP phase morphology would occur at temperatures below approximately 300°C.a

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 713: Symposium JJ – Scientific Basis for Nuclear Waste Management XXV , 2002 , JJ1.5
Copyright
Copyright © Materials Research Society 2002

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References

REFERENCES

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