Ion-Irradiation Hardening of Brazed Joints of Tungsten and Oxide Dispersion Strengthened (ODS) Ferritic Steel

Y. Himei; K. Yabuuchi; R. Kasada; S. Noh; H. Noto; T. Nagasaka; S. Nogami; A. Kimura

doi:10.2320/matertrans.MG201212

This article has now been updated. Please use the final version.

Ion-Irradiation Hardening of Brazed Joints of Tungsten and Oxide Dispersion Strengthened (ODS) Ferritic Steel

Y. Himei, K. Yabuuchi, R. Kasada, S. Noh, H. Noto, T. Nagasaka, S. Nogami, A. Kimura

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Keywords: tungsten and oxide dispersion strengthened (W/ODS) steel joint, ion-irradiation, helium-implantation, hardening mechanism

JOURNAL FREE ACCESS Advance online publication

Article ID: MG201212

DOI https://doi.org/10.2320/matertrans.MG201212

The final version of this article is now available: Vol. 54 (2013), No. 4

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Abstract

Irradiation hardening and microstructural change of the brazed-joint of W and oxide dispersion strengthened ferritic steel (ODS-FS) was investigated by nano-indentation hardness test and transmission electron microscopy after ion irradiation with 6.4 MeV Fe³⁺ ions at 500°C up to 10 dpa. Dual-beam irradiation of Fe³⁺ ions and energy-degraded 1 MeV He⁺ ion was also carried out. A considerable irradiation hardening occurred in the W base metal where dislocation loops and nano-scaled voids or He-bubbles were observed. Dual-beam irradiation enhanced the hardening. No significant hardening was observed in ODS-FS. The hardness of insert material was reduced after irradiation, which is due to the recovery of dislocations generated during joining process.

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