Abstract
The paper presents the 3-D model of the hydrogen diffusion in austenitic stainless steel. In order to model the material behaviour, a real microstructure taking into account the grain boundaries, the dislocations density, the vacancies number and the precipitates state was analysed in order to the implemented in the employed software (ANSYS). The effect of each single hydrogen trap was physically determined. The simulations were carried out by modelling the material microstructure with a high number of elements and nodes in order to improve the affordability of the obtained results. The model allowed to identify the hydrogen diffusion mode in different conditions by evaluating the weight that each single trap has on the overall process. The developed model allowed also to define the hydrogen saturation of the microstructure in different conditions of temperature.
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