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Mechanical Properties, Microstructure and Corrosion Performance of C-22 Alloy Aged at 260°C to 800°;C

Published online by Cambridge University Press:  10 February 2011

R. B. RebaK ,
T. S. E. Summers  and
R. M. Carranza
R. B. RebaK
Affiliation:
Haynes International Inc., Kokomo, IN, 46901, USA, rrebak@haynesintl.com
T. S. E. Summers
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA, 94551, USA
R. M. Carranza
Affiliation:
Comisión Nacional de Energía Atómica, 1429 Buenos Aires, Argentina
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Abstract

Changes in the microstructure, mechanical properties and corrosion resistance of C-22 alloy were studied systematically as a function of aging temperature and aging time. Aging was performed in the temperature range 260°C to 800°C for times between 0.5 h and 40,000 h. For aging temperatures of 600°C and higher, precipitation of tetrahedral close packed (TCP) phases in C-22 alloy induce a decrease in its mechanical properties and corrosion resistance in aggressive acidic solutions. At the lower aging temperatures, long range ordering (LRO) was observed, which did not produce changes in the chemical resistance of the alloy. Arrhenius extrapolations of the high temperature data predict that C-22 alloy will be thermally stable when exposed to temperatures in the order of 300°C for times higher than 10,000 years.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 608: Symposium QQ – Scientific Basis for Nuclear Waste Management XXIII , 1999 , 109
Copyright
Copyright © Materials Research Society 2000

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References

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