High-temperature helium embrittlement of 316FR steel

Shuhei Nogami, Akira Hasegawa, Takashi Tanno, Kazuto Imasaki, Kazuma Abe

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


The helium embrittlement behavior of 316FR austenitic stainless steel was investigated by a tensile test at 750°C using miniature tensile specimens, which were helium-implanted below 100°C up to 5, 30, and 100 appm using a cyclotron accelerator, and were post-implantation-annealed at 750°C for 10 and 100 h. The helium-implanted specimens showed a fully intergranular fracture regardless of the helium concentration and annealing time. No microstructural changes in the as-implanted specimen up to 30 appm and formation of a small number of helium bubbles due to the post-implantation annealing were observed. The gradual release of the helium during the tensile test started after the yielding, and a sharp peak of the helium release was detected in the final fracture phase. The total number of helium atoms released was strongly dependent on the implanted helium concentration, rather than on the annealing time.

Original languageEnglish
Pages (from-to)130-134
Number of pages5
Journaljournal of nuclear science and technology
Issue number1
Publication statusPublished - 2011


  • 316FR
  • Austenitic stainless steel
  • Cyclotron accelerator
  • Grain boundary
  • Helium bubble
  • Helium embrittlement
  • Tensile property

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering


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