Effect of weld thermal cycle, stress and helium content on helium bubble formation in stainless steels

S. Kawano, F. Kano, C. Kinoshita, A. Hasegawa, K. Abe

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Helium bubble structure was examined on a helium-implanted stainless steel after applying thermal and stress cycle using a weld thermal and stress cycle simulator. Helium ions were implanted on Type 304 stainless steels up to 200 appm uniformly to a depth of 3.5 μm. The specimens were heated at various temperatures between 1073 and 1473 K for 2 s in Ar gas atmosphere. Tensile stresses from 0.5 to 8 MPa were applied during the thermal cycle. TEM observations revealed that size of the bubbles at grain boundaries was larger for the specimens with a higher tensile stress and with a higher annealing temperature. Densities of bubbles increased with increasing helium content. A theoretical model calculation showed a good agreement with the experimental results.

Original languageEnglish
Pages (from-to)327-330
Number of pages4
JournalJournal of Nuclear Materials
Volume307-311
Issue number1 SUPPL.
DOIs
Publication statusPublished - 2002 Dec 1

ASJC Scopus subject areas

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

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