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

*Corresponding author for this work

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

1 Citation (Scopus)

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
Pages763-777
Number of pages15
VolumePart F11
DOIs
Publication statusPublished - 2018
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors - Portland, United States
Duration: 13 Aug 201717 Aug 2017
Conference number: 18

Publication series

NameMinerals, Metals and Materials Series
VolumePart F11
ISSN (Print)2367-1181
ISSN (Electronic)2367-1696

Conference

ConferenceInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors
Country/TerritoryUnited States
CityPortland
Period13/08/201717/08/2017

Keywords

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

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