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Effect of Annealing and Re-irradiation on the Copper-enriched Precipitates in a Neutron-irradiated Pressure Vessel Steel Weld

Published online by Cambridge University Press:  21 March 2011

M. K. Miller ,
K. F. Russell  and
P. Pareige
M. K. Miller
Affiliation:
Microscopy and Microanalytical Sciences Group, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6136, USA
K. F. Russell
Affiliation:
Microscopy and Microanalytical Sciences Group, Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6136, USA
P. Pareige
Affiliation:
Groupe de Physique des Matériaux, UMR CNRS 6634, Faculté des Sciences et INSA de Rouen, 76821 Mont Saint Aignan Cedex, France
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Abstract

An atom probe tomography study has been performed to estimate the matrix composition, and the size, composition and number density of the ultrafine copper-enriched precipitates that formed under neutron irradiation in a submerged arc weld (Weld 73W). This high copper (0.27 at. % Cu) weld was examined after a typical stress relief treatment of 40 h at 607°C, after neutron irradiation to a fluence of 1.8 × 1023 n m-2 (E > 1 MeV) at a temperature of 288°C, after irradiation and thermal annealing for 168 h at 454°C, and after irradiation, thermal annealing and re-irradiation to an additional fluence of 0.8 × 1023 n m-2 (E > 1 MeV). A high number density of ultrafine copper-enriched precipitates were found to form on irradiation. These precipitates were found to coarsen and decrease in number density after the annealing treatment at 454°C. These precipitates were present after re-irradiation and some additional subnanometer diameter copper- enriched precipitates were also observed. Segregation of nickel, manganese, silicon, copper and phosphorus atoms to dislocations was also observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 650: Symposium R – Microstructural Processes in Irradiated Materials-2000 , 2000 , R3.15
Copyright
Copyright © Materials Research Society 2001

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References

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