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Stainless Steel Welds in Containers of Nuclear Waste

Published online by Cambridge University Press:  28 February 2011

H. A. Menendez ,
C. F. Willis  and
T. M. Devine
H. A. Menendez
Affiliation:
Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory and the Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
C. F. Willis
Affiliation:
Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory and the Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
T. M. Devine
Affiliation:
Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory and the Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA
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Abstract

The as-welded microstructure of 308 stainless steel is usually a mixture of austenite and ferrite phases. The morphology of the duplex structure is a function of the composition of the weld. The resistance to sensitization is proportional to the amount and distribution of austenite-ferrite boundary area and the probability of precipitation of embrittling phases such as σ and α′ is proportional to the volume fraction of ferrite phase. Consequently, the properties of 308 stainless steel welds are strong functions of their microstructures. These, in turn, are primarily determined by the composition of the weld. Accordingly, to maximize the properties of welds of canisters of nuclear waste may require a restriction of the compositional limits of 308 stainless steel in order to preclude the formation of microstructures that are particularly susceptible to sensitization and/or mechanical embrittlement.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 212: Symposium P – Scientific Basis for Nuclear Waste Management XIV , 1990 , 357
Copyright
Copyright © Materials Research Society 1991

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References

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