Institute of Physics of Materials AS CR, v. v. i. > Projects > Service security of welded high-strength pressurized pipelines

Service security of welded high-strength pressurized pipelines

Co-investigatorRNDr. Jiří Svoboda, CSc., DSc.
Number of ProjectA6.14
AgencyMaterials Center Leoben
Duration2009-12-31 - 2013-12-30

The project deals with the influence of the hydrogen on strength of new steels for production of pipelines. Our team deals with development of models for hydrogen diffusion. It was shown during the project solution that hydrogen diffusion cannot be described by a simple diffusion equation with a constant diffusion coefficient. The dislocation cores and/or foreign atoms represent traps for hydrogen atoms, causing immobilization of the hydrogen and drastically influencing its diffusion. The hydrogen concentration dependent chemical diffusion coefficient can be introduced for a proper description of diffusion of hydrogen. The developed model allows not only a better description of hydrogen diffusion in steels, it allows also a more correct evaluation of measurements of hydrogen diffusion coefficients by standard methods.


Svoboda J., Mori G., Prethaler A., Fischer F.: Determination of trapping parameters and the chemical diffusion coefficient from hydrogen permeation experiments. Corros. Sci. 82 (2014) 93-100

Fischer F., Svoboda J.: Diffusion of elements and vacancies in multi-component systems. Prog. Mater. Sci. 60 (2014) 338-367

Fischer F., Svoboda J.: Formation of bubbles by hydrogen attack and elastic-plastic deformation of the matrix. Int. J. Plast. 63 (2014) 110-123

Fischer F., Svoboda J., Petryk H.: Thermodynamic extremal principles for irreversible processes in materials science. Acta Mater. 67 (2014) 1-20


Svoboda J., Shan Y., Kozeschnik E., Fischer F.: Determination of Depths of Interstitial Traps from Thermodynamic Data - A New View on Carbon Trapping and Diffusion. Model. Simul. Mater. Sci. Eng. 21 (2013) 065012

Fischer F., Mori G., Svoboda J.: Modelling the Influence of Trapping on Hydrogen Permeation in Metals. Corros. Sci. 76 (2013) 382-389

Fischer F., Svoboda J., Kozeschnik E.: Interstitial Diffusion in Systems with Multiple Sorts of Traps. Model. Simul. Mater. Sci. Eng. 21 (2013) 025008


Svoboda J., Fischer F.: Modelling for hydrogen diffusion in metals with traps revisited. Acta Mater. 60 (2012) 1211-1220