Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging

Teemu Sarikka, Roman Mouginot, Matias Ahonen, Sebastian Lindqvist, Ulla Ehrnstén, Pekka Nevasmaa, Hannu Hänninen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

The safe-end dissimilar metal weld (DMW) joining the reactor pressure vessel to the main coolant piping is one of the most critical DMWs in a nuclear power plant (NPP). DMWs have varying microstructures at a short distance across the ferritic-austenitic fusion boundary (FB) region. This microstructural variation affects the mechanical properties and fracture behavior and may evolve as a result of thermal aging during long-term operation of an NPP. This paper presents microstructural characterization performed for as-manufactured and 5000 h and 10,000 h thermally aged narrow-gap DMW representing a safe-end DMW of a modern pressurized water reactor (PWR) NPP. The most significant result of the study is that the thermal aging leads to a significant decrease in a hardness gradient observed across the ferritic-austenitic FB of the as-manufactured DMW.

Original languageEnglish
Title of host publicationProceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors
EditorsJohn H. Jackson, Denise Paraventi, Michael Wright
PublisherSpringer
Pages763-777
Number of pages15
Volume2
ISBN (Electronic)978-3-319-68454-3
ISBN (Print)978-3-319-68453-6
DOIs
Publication statusPublished - 1 Jan 2018
MoE publication typeA4 Article in a conference publication
Event18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017 - Portland, United States
Duration: 13 Aug 201717 Aug 2017

Publication series

SeriesMinerals, Metals and Materials Series
NumberPart F11
ISSN2367-1181

Conference

Conference18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017
Abbreviated titleEDM 2017
CountryUnited States
CityPortland
Period13/08/1717/08/17

Fingerprint

Dissimilar metals
Welds
Aging of materials
Nuclear power plants
Thermal aging
Fusion reactions
Pressurized water reactors
Pressure vessels
Joining
Coolants
Hardness
Mechanical properties
Microstructure

Keywords

  • Aging
  • Dissimilar metal weld
  • Microstructural characterization
  • Ni-base alloy

Cite this

Sarikka, T., Mouginot, R., Ahonen, M., Lindqvist, S., Ehrnstén, U., Nevasmaa, P., & Hänninen, H. (2018). Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging. In J. H. Jackson, D. Paraventi, & M. Wright (Eds.), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors (Vol. 2, pp. 763-777). Springer. Minerals, Metals and Materials Series, No. Part F11 https://doi.org/10.1007/978-3-319-68454-3_58
Sarikka, Teemu ; Mouginot, Roman ; Ahonen, Matias ; Lindqvist, Sebastian ; Ehrnstén, Ulla ; Nevasmaa, Pekka ; Hänninen, Hannu. / Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging. Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. editor / John H. Jackson ; Denise Paraventi ; Michael Wright. Vol. 2 Springer, 2018. pp. 763-777 (Minerals, Metals and Materials Series; No. Part F11).
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Sarikka, T, Mouginot, R, Ahonen, M, Lindqvist, S, Ehrnstén, U, Nevasmaa, P & Hänninen, H 2018, Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging. in JH Jackson, D Paraventi & M Wright (eds), Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. vol. 2, Springer, Minerals, Metals and Materials Series, no. Part F11, pp. 763-777, 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, 2017, Portland, United States, 13/08/17. https://doi.org/10.1007/978-3-319-68454-3_58

Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging. / Sarikka, Teemu; Mouginot, Roman; Ahonen, Matias; Lindqvist, Sebastian; Ehrnstén, Ulla; Nevasmaa, Pekka; Hänninen, Hannu.

Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. ed. / John H. Jackson; Denise Paraventi; Michael Wright. Vol. 2 Springer, 2018. p. 763-777 (Minerals, Metals and Materials Series; No. Part F11).

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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AU - Nevasmaa, Pekka

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Sarikka T, Mouginot R, Ahonen M, Lindqvist S, Ehrnstén U, Nevasmaa P et al. Microstructural characterization of alloy 52 narrow-gap dissimilar metal weld after aging. In Jackson JH, Paraventi D, Wright M, editors, Proceedings of the 18th International Conference on Environmental Degradation of Materials in Nuclear Power Systems – Water Reactors. Vol. 2. Springer. 2018. p. 763-777. (Minerals, Metals and Materials Series; No. Part F11). https://doi.org/10.1007/978-3-319-68454-3_58