Surface effects on martensitic stainless steelsFunded under: JRC-FUSAFE 5C
The interaction of hydrogen with MANET and LAMS has been studied using gas evolution and gas permeation methods. The diffusivity of these materials suffered a strong reduction when heat treated at 900 K in the presence of hydrogen. A study of the absorption and recombination coefficients did not explain the strong reduction effects observed. The determination of the surface composition of the material by ESCA (XPS) showed a strong increase of chromium and manganese oxide when compared with the untreated material. The magnitude of the diffusivity is shown to be dependent on the amount of Mn present in the alloy. That is, the effect is more pronounced where the amount of Mn is relatively large. This effect can be explained by a competition effect between the natural oxide present at the surface (chromium oxide) and the new oxide produced during the heat treatment due to the Mn migration to the surface of the sample.
Bibliographic Reference: Paper presented: 2nd International Workshop on Tritium Effects on Plasma Facing Components, Nagoya (JP), May 19-20, 1994
Availability: Available from (1) as Paper EN 38423 ORA
Record Number: 199510201 / Last updated on: 1995-02-21
Original language: en
Available languages: en