A gaseous permeation technique was used to measure the H permeabilities and diffusivities of specimens, after various heat treatments, at temperatures ranging from 210 to 430C. The results (tables 75 and 76) showed that the temperature dependences of the H permeabilities and diffusivities in the various alloys obeyed Arrhenius relationships over the studied temperature range. Also, the H permeation behavior was essentially independent of the heat-treatment conditions. That is, it was not significantly affected by the presence of ' precipitates in the alloys. The H permeation parameters of the Fe-based superalloys were essentially consistent with those of austenitic stainless steels. The transport of H in these face-centered cubic alloys was generally controlled only by the lattice diffusion of H.

Hydrogen Permeation and Diffusion in Iron-Base Superalloys. J.Xu, X.K.Sun, W.X.Chen, Y.Y.Li: Acta Metallurgica et Materialia, 1993, 41[5], 1455-9