Helium influence on the microstructure and swelling of 9%Cr ferritic steel after neutron irradiation to 16.3 dpa

Specially fabricated samples of the European reference 9Cr-WTaV steel EUROFER 97 alloyed with 0.081 mass% natural B and 0.081 and 0.114 mass% pure isotope super(10)B were neutron-irradiated with about 16.3 dpa at temperatures in the range from 523 K to 723 K to study the influence of helium produced...

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Bibliographic Details
Published in:Journal of nuclear materials 2014-10, Vol.453 (1-3), p.54-59
Main Authors: Klimenkov, M., Möslang, A., Materna-Morris, E.
Format: Article
Language:English
Subjects:
Bubbles
Chromium steels
Hardness
Helium
Holes
Irradiation
Microstructure
Steels
Structural steels
Swelling
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Summary:Specially fabricated samples of the European reference 9Cr-WTaV steel EUROFER 97 alloyed with 0.081 mass% natural B and 0.081 and 0.114 mass% pure isotope super(10)B were neutron-irradiated with about 16.3 dpa at temperatures in the range from 523 K to 723 K to study the influence of helium produced by super(10)B(n, alpha ) super(7)Li transmutation reaction on microstructure, swelling and hardness. The spatial and size distributions of helium bubbles or cavities after irradiation at different temperatures were investigated by transmission electron microscopy. Vickers microhardness HV0.1 tests were performed on the as received specimens and specimens after irradiation. The influence of irradiation temperature and helium concentration on the size and density of the bubbles or cavities was analyzed and correlations with the hardness, tensile properties, and the fracture surface were discussed.
ISSN:0022-3115
DOI:10.1016/j.jnucmat.2014.05.001