Impact property of low-activation vanadium alloy after laser welding and heavy neutron irradiation

Weld specimens of the reference low activation vanadium alloy, NIFS-HEAT-2, were irradiated up to a neutron fluence of 1.5×1025nm−2 (E>0.1MeV) (1.2dpa) at 670K and 1.3×1026nm−2 (5.3dpa) at 720K in the JOYO reactor in Japan. The base metal exhibited superior irradiation resistance with the ductile...

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Bibliographic Details
Published in:Journal of nuclear materials 2013-11, Vol.442 (1-3), p.S364-S369
Main Authors: Nagasaka, Takuya, Muroga, Takeo, Watanabe, Hideo, Miyazawa, Takeshi, Yamazaki, Masanori, Shinozaki, Kenji
Format: Article
Language:English
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Summary:Weld specimens of the reference low activation vanadium alloy, NIFS-HEAT-2, were irradiated up to a neutron fluence of 1.5×1025nm−2 (E>0.1MeV) (1.2dpa) at 670K and 1.3×1026nm−2 (5.3dpa) at 720K in the JOYO reactor in Japan. The base metal exhibited superior irradiation resistance with the ductile-to-brittle transition temperature (DBTT) much lower than room temperature (RT) for both irradiation conditions. The weld metal kept the DBTT below RT after the 1.2dpa irradiation; however, it showed enhanced irradiation embrittlement with much higher DBTT than RT after the 5.3dpa irradiation. The high DBTT for the weld metal was effectively recovered by a post-irradiation annealing at 873K for 1h. Mechanisms of the irradiation embrittlement and its recovery are discussed, based on characterization of the radiation defects and irradiation-induced precipitation.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2013.05.046