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Post-irradiation annealing of Ni-Mn-Si-enriched clusters in a neutron-irradiated RPV steel weld using Atom Probe Tomography
Nuclear National Labs, UK.
University of Oxford, Department of Materials.
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2015 (English)In: Journal of Nuclear Materials, ISSN 0022-3115, E-ISSN 1873-4820, Vol. 459, 127-134 p.Article in journal (Refereed) Published
Abstract [en]

Atom Probe Tomography has been performed on as-irradiated and post-irradiation annealed surveillance weld samples from Ringhals Unit 3. The weld contains low Cu (0.07at.%) and high Ni (1.5at.%). A high number density (~4x1023 m-3) of Ni-Mn-Si-enriched clusters was observed in the as-irradiated material. The onset of recovery was observed during the annealing for 30 min at 450°C. Much more significant dissolution of clusters occurred during the 10 minute 500°C anneal, resulting in a reduction in mean cluster size and a halving of their volume fraction.


Detailed analyses of the changes in microstructure demonstrate that the dissolution process is driven by migration of Mn atoms from the clusters. This may indicate a strong correlation between Mn and point defects. Dissolution of the clusters is shown to correlate with recovery of mechanical properties in this material.

Place, publisher, year, edition, pages
2015. Vol. 459, 127-134 p.
Keyword [en]
Neutron irradiation, Low alloy steels, post irradiation annelaing, atom probe, clustering, materials ageing
National Category
Materials Engineering
Research subject
Materials Science and Engineering
URN: urn:nbn:se:kth:diva-164152DOI: 10.1016/j.jnucmat.2015.01.027ISI: 000350710700018ScopusID: 2-s2.0-84921519789OAI: diva2:803862

QC 20150414

Available from: 2015-04-14 Created: 2015-04-14 Last updated: 2016-02-09Bibliographically approved

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