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Atom Probe Tomography characterization of the microstructural evolution of a low copper reactor pressure vessel steel under neutron irradiation

Published online by Cambridge University Press:  01 February 2011

Hefei Huang
Affiliation:, GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
Bertrand Radiguet
Affiliation:, GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
Patrick Todeschini
Affiliation:, EDF-R&D-MMC, Moret sur loing, France
Guillaume Chas
Affiliation:, EDF-CEIDRE/DLAB, Chinon, France
Philippe Pareige
Affiliation:, GPM-UMR CNRS6634- Université et Insa de Rouen, Saint Etienne du Rouvray, France
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A low copper reactor pressure vessel steel was characterised by atom probe tomography after neutron irradiation at different fluences. The specimens were irradiated within the frame of the Surveillance Program of a production reactor. Roughly spherical clusters enriched in nickel, manganese, silicon and, in a lesser extent, phosphorus and copper were observed at all fluences. The chemical composition of these clusters shows no evolution with fluence, as well as their diameter, close to 3 nm. Their number density increases linearly with the neutron fluence. A continuous segregation of the elements found in the clusters is also observed along dislocation lines, with similar enrichments.

Research Article
Copyright © Materials Research Society 2010

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