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Microstructure and Post-Irradiation Annealing Behavior of 20% Cold-Worked 316 Stainless Steel

Published online by Cambridge University Press:  21 March 2011

J. I. Cole ,
T. R. Allen ,
H. Kusanagi ,
K. Dohi  and
J. Ohta
J. I. Cole
Affiliation:
Argonne National Laboratory-West, PO Box 2528, Idaho Falls, ID 83403
T. R. Allen
Affiliation:
Argonne National Laboratory-West, PO Box 2528, Idaho Falls, ID 83403
H. Kusanagi
Affiliation:
Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan
K. Dohi
Affiliation:
Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan
J. Ohta
Affiliation:
Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan
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Abstract

Microstructural examination and in situ post-irradiation annealing studies were carried out on 20% cold-worked 316 stainless steel (SS) hexagonal duct material following irradiation in the reflector region of the EBR-II reactor. Stainless steel hexagonal ducts were used to house reactor subassemblies and provide a valuable source of information on irradiation behavior of reactor structural materials at lower dose-rates (on the order of 10-8 dpa/sec) than previously examined. The microstructural development of samples irradiated to doses of 1, 20 and 30 dpa is examined, while the post-irradiation annealing behavior of a sample irradiated to 20 dpa is described. Annealing studies were performed at 370 and 500°C to examine the kinetics of radiation damage recovery as a function of annealing temperature. The initial (pre-annealed) microstructures consists of a substantial density of irradiation induced chromium-rich M23C6 and M6C carbides which form both on the grain boundaries and within the grain interiors. Recovery of the cold- work is evident in the 1 dpa sample while samples irradiated to 20 and 30 dpa possess dense populations of voids and dislocation structures consisting of networks of line dislocations and faulted dislocation loops. Results indicate that post-irradiation annealing of the samples at 370°C for 1 hour has little effect on the microstructure, while further annealing at 500°C for 1 hour results in void shrinkage, the formation of small cavities, and a reduction in the dislocation loop and network density.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R2.9
Copyright
Copyright © Materials Research Society 2001

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References

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