Hydrogen in Engineering Metallic Materials

Gavriljuk, V.G.; Shyvaniuk, V. M.; Teus, S. M.

doi:10.1007/978-3-030-98550-9

Cited by 8 publications

(3 citation statements)

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“…As hydrogen induces ferromagnetism in the f.c.c. iron, the calculations for the Fe32H system were performed taking into account the spin polarization, see [27] for details. Important for the interpretation of nitrogen-and hydrogen-caused softening is a similar effect of hydrogen and nitrogen on the electron structure of austenitic steels, see Fig.…”

Section: Conditions For Reversibility Of Plastic Deformation During F...mentioning

confidence: 99%

“…Relating to the hydrogen effect in austenitic steels, the inherently existing short-range atomic order, namely the short-range decomposition of the f.c.c. iron-based solid solutions, results in localization of plastic deformation which is merely enhanced by hydrogen due to its different solubility in the submicrovolumes of different chemical compositions and, consequently, the increased mobility of dislocations in those of locally higher hydrogen concentration, see about details Gavriljuk et al [36].…”

Section: Conditions For Reversibility Of Plastic Deformation During F...mentioning

confidence: 99%

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On the Nature of Positive Hydrogen and Nitrogen Effects on Fatigue of Austenitic Steels

Gavriljuk¹,

Shyvaniuk²,

Teus³

2022

Metallofiz. Noveishie Tekhnol.

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The hydrogen and nitrogen effects on fatigue life of austenitic steels are discussed using the ab initio calculations of electron structure, analysis of atomic distribution and dislocation substructure. As shown, both elements increase the concentration of free electrons in the f.c.c. iron softening thereby the crystal lattice, decreasing specific energy of dislocations and increasing their mobility. As a result, the dominant occurrence of short-range atomic order in the metal solid solutions causes localization of plastic deformation and consequent formation of dislocation slip bands. A combination of these factors realizes in the localized reversible planar slip of dislocations, which prevents their intersection with nucleation of submicrocracks and decreases the crack growth rate during fatigue tests, i.e., prolongs the fatigue life.

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Section: Conditions For Reversibility Of Plastic Deformation During F...mentioning

confidence: 99%

Section: Conditions For Reversibility Of Plastic Deformation During F...mentioning

confidence: 99%

On the Nature of Positive Hydrogen and Nitrogen Effects on Fatigue of Austenitic Steels

Gavriljuk¹,

Shyvaniuk²,

Teus³

2022

Metallofiz. Noveishie Tekhnol.

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“…The diffusion of hydrogen H in metals has been the subject of intense study in recent years, due to the practical interest in using the metal-hydrogen system for several technological applications [1,2]. Diffusion of H in Fe and other metals is very important as it leads to engineering problems associated with hydrogen embrittlement and degradation of high strength steels, reactor materials, etc.…”

Section: Introductionmentioning

confidence: 99%

Statistical Model of Hydrogen Diffusion in BCC Metals

Bobyr,

Odqvist

2023

DDF

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The purpose of this work is developing of the statistical model of hydrogen diffusion in the crystal lattice of BCC metals with an estimate of the contribution of quantum effects and deviations from the Arrhenius equation. The values of the statistical model calculations of H diffusion coefficients in Fe, V, Nb and Ta are in good agreement with the experimental data. The statistical model can also explain deviations from the Arrhenius equation at temperatures 300-500 K in Fe and Nb. The downward deviation of the diffusion coefficient at 300K can be explained by the fact that the statistical model does not consider the tunneling effect at temperatures below 300K. It was suggested that thermally activated fast tunnelling transition of hydrogen atoms through the potential barrier at temperatures below 500 K provides an almost free movement of H atoms in the α-Fe and V. Using the statistical model allows for the prediction of the diffusion coefficient for H in BCC metals at intermediate temperatures.

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