Abstract
The paper addresses the numerical simulation of conditions in which the measurement of thermal desorption spectra of hydrogen (TDS) is carried out. Plane steel samples of 10 mm thickness were used as the specimens for simulation. The skin effect which is observed with standard hydrogen charging of samples was accounted for the initial conditions. The standard diffusion of hydrogen was simulated according to Fick’s law. Solution of the Fick’s equation is obtained by finite element methods using the developed code. The resulting solutions show that standard hydrogen charging can lead to the appearance of an additional TDS peak, even without taking into account the traps. New interpretation of the TDS method for hydrogen dissolved in a solid was suggested.
Highlights
Hydrogen which is dissolved in metals is the most dangerous component
The rate of hydrogen absorption by a metal depends on its chemical composition, structure, mechanical loading conditions, temperature, and chemical composition of the environment
Using the thermal desorption spectra of hydrogen (TDS) method is problematic without charging samples with hydrogen
Summary
Hydrogen which is dissolved in metals is the most dangerous component. It begins to induce destruction processes in some metals starting with the mass concentrations of 0.5 ppm. The discrepancy between the diffusion nature of hydrogen extraction and its modelling results in different values of binding energies for samples of different shapes and dimensions. We investigated these inconsistencies in detail, cf [47]. In some cases there is a single peak All the same, this peak is considered as a superposition of hydrogen fluxes from traps with different binding energies and is laid out using an approximation method into smaller ones. This peak is considered as a superposition of hydrogen fluxes from traps with different binding energies and is laid out using an approximation method into smaller ones We propose a new approach to the problem considered
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