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Microstructural evolution of welded stainless steels on integrated effect of thermal aging and low flux irradiation
KTH. Studsvik Nuclear AB, Sweden.
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2018 (English)In: 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Springer International Publishing , 2018, Vol. Part F11, p. 703-710Conference paper, Published paper (Refereed)
Abstract [en]

The combined effect of thermal aging and irradiation on cast and welded stainless steel solidification structures is not sufficiently investigated. From theory and consecutive aging and irradiation experiments, the effect of simultaneous low rate irradiation and thermal aging is expected to accelerate and modify the aging processes of the ferrite phase. Here, a detailed analysis of long-term aged material at very low fast neutron flux at LWR operating temperatures using Atom Probe Tomography is presented. Samples of weld material from various positions in the core barrel of the Zorita PWR are examined. The welds have been exposed to 280–285 °C for 38 years at three different neutron fluxes between 1 × 10−5 and 7 × 10−7 dpa/h to a total dose of 0.15–2 dpa. The aging of the ferrite phase occurs by spinodal decomposition, clustering and precipitation of e.g. G-phase. These phenomena are characterized and quantitatively analyzed in order to understand the effect of flux in combination with thermal aging.

Place, publisher, year, edition, pages
Springer International Publishing , 2018. Vol. Part F11, p. 703-710
Keywords [en]
Irradiation, Spinodal decomposition, Stainless steel, Thermal aging, Weld ferrite
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-224267DOI: 10.1007/978-3-319-68454-3_54Scopus ID: 2-s2.0-85042420655ISBN: 9783319684536 OAI: oai:DiVA.org:kth-224267DiVA, id: diva2:1190931
Conference
18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Portland, United States, 13 August 2017 through 17 August 2017
Note

QC 20180315

Available from: 2018-03-16 Created: 2018-03-16 Last updated: 2018-03-16Bibliographically approved

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Efsing, Pål

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CiteExportLink to record
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Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
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  • asciidoc
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