Effect of radiogenic helium on stainless steel 12Cr18Ni10Ti structural changes and hydrogen sorption

E A Denisov,S L Kanashenko,R A Causey,S K Grishechkin,M Glugla, A Hassanein,T N Kompaniets,A V Kurdyumov,I L Malkov,A A Yukhimchuk

FUSION SCIENCE AND TECHNOLOGY（2008）

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Abstract

The tritium trick technique was used to build-up radiogenic helium inside stainless steel 12Cr18Ni10Ti (SS). A great quantity of defects with a mean diameter of 20 nm, most probably platelet-like bubbles with He-3 atoms, was observed in He-3-containing samples. The mean density of these bubbles in SS samples containing similar to 75 appm of He-3 is estimated to be 6.10(20) m(-3). Much larger helium bubbles were observed in SS after annealing the samples at T >= 1170 K Thermal release of radiogenic helium occurs at T>1500 K. The presence of 3He in structural materials causes the formation of an additional state for hydrogen sorption.

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Key words

materials science,metallurgy,hydrogen,corrosion,helium 3,helium,density,annealing,tritium,materials,sorption

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