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Cluster formation in in-service thermally aged pressurizer welds
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.). Ringhals AB, Sweden.ORCID iD: 0000-0003-1498-5691
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2018 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 504, p. 23-28Article in journal (Refereed) Published
Abstract [en]

Thermal aging of reactor pressure vessel steel welds at elevated temperatures may affect the ductile-to-brittle transition temperature. In this study, unique weld material from a pressurizer, with a composition similar to that of the reactor pressure vessel, that has been in operation for 28 years at 345 °C is examined. Despite the relatively low temperature, the weld becomes hardened during operation. This is attributed to nanometre sized Cu-rich clusters, mainly located at Mo- and C-enriched dislocation lines and on boundaries. The welds have been characterized using atom probe tomography, and the characteristics of the precipitates/clusters is related to the hardness increase, giving the best agreement for the Russell-Brown model.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 504, p. 23-28
Keyword [en]
Atom probe tomography, Precipitation, RPV steel, Thermal aging
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Identifiers
URN: urn:nbn:se:kth:diva-224810DOI: 10.1016/j.jnucmat.2018.03.017Scopus ID: 2-s2.0-85043976074OAI: oai:DiVA.org:kth-224810DiVA, id: diva2:1193601
Note

QC 20180327

Available from: 2018-03-27 Created: 2018-03-27 Last updated: 2018-05-14Bibliographically approved

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Boåsen, MagnusEfsing, Pål

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