Benchmark Study of Measurements of Hydrogen Diffusion in Metals

Arseniev, Dmitry G.; Belyaev, Аlexander K.; Polyanskiy, A. M.; Polyanskiy, Vladimir A.; Yakovlev, Yu. A.

doi:10.1007/978-3-030-11665-1_3

Cited by 7 publications

(3 citation statements)

References 59 publications

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“…In fact, only surface sorption and desorption can be adequately evaluated using this method [22]. This leads to large variations in activation energy values for the same materials [23][24][25][26].…”

Section: The Most Common Methodsmentioning

confidence: 99%

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Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

et al. 2019

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In modern world more and more materials with extreme properties are being used: high alloys, high-entropy alloys, nanostructured materials, etc. The extreme properties of these materials make them especially sensitive to hydrogen diffusion. Hydrogen can severely impair their properties and cause failures in structures and machines the material is used in. Nowadays, when structures and components are becoming increasingly complex, the use of 3D printing technology is becoming more widespread. Components made using 3D printing technologies are usually layered, which increase the amount of hydrogen that can diffuse into the material. The amount of hydrogen concentration in 3D printed nickel samples has been determined using vacuum heating method in hydrogen analyzer AV-1. The samples were held at different constant temperatures and the total amount of hydrogen extracted at those temperatures was calculated. A mathematic model was developed to evaluate the amount of hydrogen extracted at a given temperature. The evaluation was then compared to the experiment results, and the validity of the mathematical model and the selected hydrogen activation energies was verified.

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Section: The Most Common Methodsmentioning

confidence: 99%

“…This effect is usually not discussed, however, research shows, that the growth of the background flows can significantly impact the results of the measurements with a constant increase in temperature of a studied sample cf. [24,29,30].…”

Section: Experimental Techniquementioning

confidence: 99%

Calculating the activation energies of nickel, manufactured using 3D printing technology, with multichannel hydrogen diffusion model

et al. 2019

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“…К преимуществам многоконтинуальной модели следует отнести возможность решения задач о динамическом нагружении металла, содержащего водород, в том числе циклическом [143][144][145][146][147], возможность учитывать одновременно внутреннее давление, создаваемое водородом, и влияние водорода на механические характеристики металла [148].…”

Section: многоконтинуальные модели водородной хрупкостиunclassified

Models of hydrogen influence on the mechanical properties of metals and alloys

Yakovlev

Polyanskiy

Sedova

et al. 2020

PNRPU Mechanics Bulletin

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The article yields a survey of the key models of mechanics that are used to describe the effects of hydrogen embrittlement, hydrogen cracking, and hydrogen-induced destruction. The main attention is paid to models which are used to calculate the stress-strain state of metal samples, parts and machine components and have the potential for specific engineering applications. From a mechanical perspective, the effect of hydrogen on the material properties is a classic problem of the influence of a small parameter, since the hydrogen concentrations critical for the strength and ductility of metals are usually small. In the vast majority of models this effect is reduced to the hydrogen redistribution within the material volume and localization of concentrations in the critical fracture zones. The authors identified four main approaches that allow one to take into account the influence of a small parameter: (i) hydrogen-enhanced decohesion (HEDE), (ii) hydrogen-enhanced localized plasticity (HELP), (iii) account for additional internal pressure due to the hydrogen dissolved in metals, and (iv) bi-continuum approach that takes into account the internal hydrogen pressure and weakening of material in the framework of a special model of a solid. The links between the main approaches are established. Systematization of publications was carried out, similarities and differences in the description of the internal transport and accumulation of hydrogen in metals are highlighted. It is indicated that the predominant number of publications is devoted to the HEDE model, but so far there is no published data on the application of this model to real problems of engineering practice; only modeling the results of mechanical tests of cylindrical and prismatic samples were considered. In fact, other less popular approaches have more practical applications. The main unresolved issue in the verification of all models is the local concentration of hydrogen, which is a source of premature destruction of metals under load. All the methods for measuring local concentrations are indirect. Even in the case of applying sophisticated physical methods, mechanical surface preparation is required, which destroys the initial natural concentration of hydrogen. The lack of reliable data on the distribution of hydrogen concentration excludes the possibility of unambiguously determination of all the model parameters. On the one hand, it allows fitting to any experimental data, and on the other hand, it reduces the predictive engineering value of all models, since a qualitative fitting is not sufficient for engineering strength analysis.

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