Plastic strain and residual stress distributions in an AISI 304 stainless steel BWR pipe weld

Tapio Saukkonen*, Miikka Aalto, Iikka Virkkunen, Ulla Ehrnstén, Hannu Hänninen

*Corresponding author for this work

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

5 Citations (Scopus)

Abstract

In AISI 304 stainless steel pipe welds weld shrinkage causes large variations in residual plastic strain in different parts of the weld metal and heat-affected zone (HAZ). The amount of strain was analyzed by EBSD quantitatively by comparing the intra-grain misorientations to the calibration curve. Highest degrees of plastic strain (10...20%) were detected in the HAZ close to the root area of a prototypical BWR plant weld. Strain in the weld metal varies in the different directions of solidification, being high in the weld bead boundaries and near the fusion lines. Preliminary studies of the effects of mechanical and elastic anisotropy of the weld metal microstructure on the grain size level were performed by EBSD and nanoindentation. The residual stress distribution in the same weld cross-section was determined by a contour method. The residual strain and stress distributions are superimposed and EAC susceptibility of various areas of the pipe weld is evaluated and discussed.

Original languageEnglish
Title of host publication15th International Conference on Environmental Degradation of Materials in Nuclear Power Systems-Water Reactors
PublisherJohn Wiley and Sons
Pages2221-2237
Number of pages17
ISBN (Electronic)9781118456835
ISBN (Print)9781118132418
Publication statusPublished - 2011
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors - Colorado Springs, United States
Duration: 7 Aug 201111 Aug 2011
Conference number: 15

Conference

ConferenceInternational Conference on Environmental Degradation of Materials in Nuclear Power Systems and Water Reactors
Abbreviated titleED
CountryUnited States
CityColorado Springs
Period07/08/201111/08/2011

Keywords

  • Boiling water reactor
  • Electron backsacatter diffraction
  • Mechanical anisotropy
  • Residual stress and strain
  • Stainless steel piping
  • Stress corrosion cracking
  • Welding

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