Boundary Layer Influence on the Distribution of Hydrogen Concentrations During Hydrogen-Induced Cracking Test of Steels

Alekseeva, Ekaterina; Belyaev, Аlexander K.; Zegzhda, A. S.; Polyanskiy, A. M.; Polyanskiy, Vladimir A.; Frolova, Ksenia P.; Yakovlev, Yu. A.

doi:10.17804/2410-9908.2018.3.043-057

Cited by 10 publications

(6 citation statements)

References 9 publications

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“…To verify the model, we refer to an experiment reported in [5, 9]. A cylindrical specimen of radius 4 mm and length 40 mm made of the weather-resistant steel 14HGNDC was charged with hydrogen in an electrolyte according to NACE Standard TM0284-2106-SG.…”

Section: Results and Verificationmentioning

confidence: 99%

“…The temperature 500 • C-1000 • C is recommended for the extraction of the total amount of hydrogen during the hot vacuum extraction [5,19]. In [5,9], a temperature of 800 • C was chosen. The amount of hydrogen released from all cylindrical parts at each temperature was measured.…”

Section: Results and Verificationmentioning

confidence: 99%

“…A uniform distribution of hydrogen can be obtained only after 500 h, which is several times larger than the standard average duration of the experiment. Standard hydrogen saturation of specimens in an electrolyte also results in an extremely nonuniform distribution of hydrogen across the specimen [5, 9, 10]. In fact, what is saturated, in both methods, is only a thin layer in the vicinity of the surface.…”

Section: Introductionmentioning

confidence: 99%

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Application of micropolar theory to the description of the skin effect due to hydrogen saturation

Frolova

Vilchevskaya

Bessonov

et al. 2021

Mathematics and Mechanics of Solids

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A model is proposed for the description of a highly inhomogeneous distribution of hydrogen within a saturated metal specimen (the so-called skin effect due to hydrogen saturation). The model is based on the micropolar continuum approach and results in a nonuniform stress–strain state of a cylindrical metal specimen due to distributed couples or microrotations. The dependence of the diffusion coefficient on the strain energy is considered in order to model stress-induced diffusion. Accumulation of hydrogen within a thin boundary layer results in a highly nonuniform distribution of hydrogen across the specimen. The mutual influence of the stress–strain state and hydrogen accumulation is taken into account. The estimated thickness of the surface layer containing hydrogen is comparable to the thickness observed in experiments. The predicted average concentration coincides with experimental data.

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Section: Results and Verificationmentioning

confidence: 99%

Section: Results and Verificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of micropolar theory to the description of the skin effect due to hydrogen saturation

Frolova

Vilchevskaya

Bessonov

et al. 2021

Mathematics and Mechanics of Solids

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“…However, there are several works in which the distribution of hydrogen concentrations after standard charging was measured, see [19][20][21][22][23]. This work covers all standardized methods of charging samples: in gaseous hydrogen, in saline solution and cathode charging.…”

Section: Hydrogen Charging Effectmentioning

confidence: 99%

Surface vs diffusion in TDS of hydrogen

et al. 2019

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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.

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“…The duration was selected that the hydrogen would be evenly distributed cf. [27]. According to the data presented in [28], for a sample 8mm in diameter, 500 hours were needed for the even distribution.…”

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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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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Boundary Layer Influence on the Distribution of Hydrogen Concentrations During Hydrogen-Induced Cracking Test of Steels

Abstract: Boundary layer influence on the distribution of hydrogen concentrations during hydrogen-induced cracking test of steels /

Cited by 10 publications

References 9 publications

Application of micropolar theory to the description of the skin effect due to hydrogen saturation

Application of micropolar theory to the description of the skin effect due to hydrogen saturation

Surface vs diffusion in TDS of hydrogen

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

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