Measurements of surface and bulk properties for the interaction of hydrogen with inconel 600

Role of grain boundaries in the diffusion of hydrogen in nickel base alloy 600: Study coupling thermal desorption mass spectroscopy with numerical simulation

“…Experimental results "Traditional" and "hybrid" TDS desorption spectra were acquired for both the [heat treated] polycrystalline and single Table 3 e Pre-exponential constant (D 0 ) and activation energy (E D ) for the diffusion of 1 H and its isotopic tracers (i.e. 2 H and 3 H) in A600 extracted from literature [27,28] and measured in this study.…”

“…Such evolution of the potential for a constant imposed current shows that the steady state approximation can be applied to the 2 H surface discharge mechanism, leading to the assumption that the 2 H surface concentration remains constant during charging. The hypothesis (1e) is supported by estimating the 2 H characteristic diffusion length for the charging duration (on the basis of published diffusion data for H (and its isotopes) in A600 [27,28]), which remains small, compared to the sample thickness.…”

“…In the body of this article, the role grain boundaries play in H diffusion and/or trapping in nickel base alloy 600, having a grain size of several tens of micrometers, will be discussed. The diffusion of hydrogen and its isotopes (deuterium ( 2 H) and tritium ( 3 H)) in A600 has been studied in previous works in the temperature range of 423 Ke675 K [27] and 573 Ke973 K [28]. The D 0 and E D values obtained in these two studies for H, 2 H and 3 H are relatively close; this seems to demonstrate that the isotopic effect is negligible with regards to the uncertainty associated with the measurement and determination of the diffusion coefficient.…”

“…The D 0 and E D values obtained in these two studies for H, 2 H and 3 H are relatively close; this seems to demonstrate that the isotopic effect is negligible with regards to the uncertainty associated with the measurement and determination of the diffusion coefficient. Unfortunately, grain size was not specified in either publication [27,28] and therefore it is impossible to evaluate the effect of grain boundaries based solely upon these previous works.…”

The effect of strain on the trapping of hydrogen at grain-boundary carbides in Ni-Cr-Fe alloys

“…Two others activation energy. Since the apparent activation energy from have investigated the activation energy of alloy 600: Rota this experimental method is in the temperature range where et al [29] and Kishimoto et al [30] Rota et al determined an most desorption occurs, the 48.6 kJ/mol value will be used activation energy of 49.8 kJ/mol, while Kishimoto et al in this analysis. In contrast to the work of Uhlemann and determined an activation energy of 43 kJ/mol.…”