Effect of He-Injection on Irradiation Damage in Heat Affected Zone of Welded SUS304 Steel

Dong-Su Bae; Hiroshi Kinoshita; Tamaki Shibayama; Heishichiro Takahashi

doi:10.2320/matertrans.45.59

Dong-Su Bae, Hiroshi Kinoshita, Tamaki Shibayama, Heishichiro Takahashi

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Keywords: irradiation damage, electron/He⁺-ion dual-beam irradiation, electron-beam irradiation after He-injection, 304 stainless steel, high voltage electron microscope, in-situ observation, heat affected zone, void swelling, segregation

JOURNAL FREE ACCESS

2004 Volume 45 Issue 1 Pages 59-64

DOI https://doi.org/10.2320/matertrans.45.59

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Abstract

The heat affected zone (HAZ) of welded SUS304 steel has been irradiated using three irradiation modes of electron single irradiation, electron irradiation after He-injection and electron /He ion dual-beam irradiation by 1250 kV high voltage electron microscope (HVEM) connected with an ion accelerator. Void size in the specimen with pre-injected helium increased considerably and the void size distribution was a bi-modal. Void swelling is the highest in the case of electron irradiation after He-injection. The segregation of solutes of Ni and Cr near grain boundary was suppressed in the cases of electron/He⁺-ion dual-beam and electron irradiation after He-injection comparing with electron single irradiation.

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