Effect of helium on grain boundary segregation of austenitic stainless steel after proton irradiation

Kusuma Dewi, Akira Hasegawa, Satoshi Otsuka, Katsunori Abe

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In ITER, austenitic stainless steels are under consideration as a blanket structural material for temperature below 200°C. Transmuted helium will be also produced in austenitic stainless steels by high-energy neutron irradiation, and it will affect microstructural development including grain boundary segregation. In this paper, the effects of helium on grain boundary segregation in austenitic stainless steels are studied using ion-irradiation experiment. The result showed that the onset of radiation induced segregation (RIS) by proton irradiation occurs somewhere between 0.1 and 0.5 dpa. Helium pre-implantation significantly reduced RIS of the major alloying elements. Mechanisms are discussed. Comparison of this result with neutron irradiated induced segregation showed qualitative agreement in the data trends. However, a large amount of segregation was observed in the proton irradiated 304 austenitic stainless steels specimens.

Original languageEnglish
Pages (from-to)585-587
Number of pages3
JournalFusion Technology
Volume39
Issue number2
Publication statusPublished - 2001 Dec 1

ASJC Scopus subject areas

  • Engineering(all)

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