An examination of the precipitation behavior of proton irradiated dual phase 308L weldment filler materials

Zhen Li, Xun Zhan, Waclaw Swiech, Honghui Zhou, Weicheng Zhong, Benjamin J. Sutton, Carly J. Romnes, Dhruval K. Patel, Nachiket S. Shah, Brent J. Heuser

Research output: Contribution to journalArticlepeer-review


Voids, G phase particles, and Ni-Si rich clusters in proton irradiated dual phase 308L groove filler of a SA508–304 L dissimilar metal weldment are analyzed using advanced characterization techniques. These weldments are often used in light water nuclear reactors and are subject to enhanced corrosion and associated stress corrosion cracking (SCC). Radiation damage is known to accelerate SCC. Ni-Si enriched clusters were observed in proton irradiated γ austenite, while G phase M6Ni16Si7 (where M transition metal element) precipitates were observed in proton irradiated δ ferrite. Compositional analysis of the G phase precipitates and Ni-Si clusters from STEM-EDS and APT are compared. Unlike G phase particles in proton irradiated δ ferrite, Ni-Si clusters in proton irradiated γ austenite are not rich in Mn. Both STEM-EDS and APT line-scan profiles of the Ni-Si clusters show that the Fe and Cr concentration gradient between matrix γ austenite and the Ni-Si clusters is not as sharp as those between matrix δ ferrite and G phase. Further, HR-STEM imaging indicates that the lattice parameter of the Ni-Si clusters is commensurate with γ austenite and the clusters do not represent the precipitation of a second phase. Our analysis demonstrates the density and volume fraction of G phase particles and the density of voids scales with proton irradiation damage and the energy to recoils.

Original languageEnglish (US)
Article number154287
JournalJournal of Nuclear Materials
StatePublished - Apr 15 2023


  • 308L groove filler
  • Atom probe tomography
  • G phase precipitation
  • Ni-Si clustering
  • Proton irradiation
  • SA508–304L weldment

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Materials Science(all)
  • Nuclear Energy and Engineering


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