Study of Isotope Effects in the Hydrogen Transport of an 8% CrWVTa Martensitic Steel

Abstract

A time-dependent gas-phase isovolumetric desorption technique has been used to assess the isotope effects in the diffusive transport parameters of hydrogen in an 8% CrWVTa reduced activation martensitic steel in the temperature range of 423-892 K and driving pressures from 4 Â 10 4 -1 Â 10 5 Pa. The experiments have been run with both protium and deuterium obtaining their respective transport parameters, diffusivity ðDÞ, Sieverts' constant ðK S Þ, permeability ðFÞ, trap site density ðh t Þ and the trapping activation energy ðE t Þ. Isotope effects on steel are analysed and compared with a-iron. A new way to derive more accurate tritium transport parameters is proposed.

Fusio Nuklearra Euskal Herriko Unibertsitatetik

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