An ingenious approach of determining hydrogen isotope solubilities, diffusivities and permeabilities in GWHER-1 stainless steel

In this paper, by using an ingenious method, the hydrogen isotope solubilities and diffusivities in GWHER-1 stainless steel have been determined by a vacuum heating degassing approach at the temperature range of 597–1022 K on a set of specimens with different sizes previously charged for 24 h under a hydrogen isotope pressure of 10⁵ Pa in the temperature range of 800–1000 K. The permeabilities are then derived from the relation \varPhi = DK_s. It is found D = 1.52 \times 10^?6exp(?54100/RT), K_s = 2.2 \times 10^?6exp(?5400/RT) and \varPhi = 3.3 \times 10^?12exp(?59500/RT) for hydrogen, where K_s (Sieverts' constant) is given in Pa^?1/2, D in m²\cdot s^?1\cdot Pa^?1/2, T in K and R=8.31J\cdotmol^?1\cdot K^?1. By taking isotope effects into account, the corresponding Arrhenius relations for deuterium and tritium are also deduced.