Migration through membranes of this steel was studied by using permeation cell techniques. In some cases, the up-stream side was covered with a layer of liquid Pb-17%Li alloy. The presence of this layer decreased the permeability by a factor of between 1 and 4 (table 63), and the activation energy for permeation decreased from 52 to 34kJ/mol. This implied that the solubility of D in Pb-17%Li alloy was lower than that in the steel and was almost independent of the temperature. The diffusivities also decreased by a factor of about 2 (table 64) when the Pb-17%Li alloy was present.
Deuterium Permeability of the Austenitic Stainless Steel AISI316. O.Gautsch, G.Hoddap: Journal of Nuclear Materials, 1988, 152, 35-40
Table 66
Diffusion Parameters for AISI 321
Cold-Rolling (%) | α' (%) | Do (m2/s) | E (kJ/mol) |
0 | 0 | 4.61 x 10-7 | 53.79 |
21 | 9.3 | 5.70 x 10-7 | 47.52 |
34 | 26 | 2.74 x 10-7 | 41.11 |
54 | 51 | 8.84 x 10-8 | 30.53 |
65 | 55 | 8.31 x 10-8 | 29.55 |