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Abstract

The evaluation of hydrogen diffusivity D and Sieverts' constant K(s) in the temperature range 550-900 K at a working pressure of 1E5 Pa was carried out experimentally by a gas evolution method in two different low activation martensitic steels (LAMS), namely LA12TaLC and LA7TaLN, which are possible candidates as armour and/or structural materials for the demonstration reactor (DEMO).
After a complete set of measurements, a strong reduction of 'apparent' diffusivity was observed in LA12TaLC, in contrast with LA7TaLN which has given no variation of D. The different content of Cr in these two steels, is responsible for a different oxidation resistance against gas oxidizing impurities present in the gas atmosphere which give, as a result, a superficial oxide layer formation in LA12TaLC, which acts as diffusion barrier to hydrogen.

Additional information

Authors: ALBERICI S, JRC Ispra (IT);PERUJO A, JRC Ispra (IT);CAMPOSILVAN J, JRC Ispra (IT)
Bibliographic Reference: Paper presented: XIII Congresso Nazionale Sulle Scienza e Tecnologia del Vuoto, Milano (IT), February 14-16, 1996
Availability: Available from (1) as Paper EN 39641 ORA
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