Simulation of hydrogen permeation through pure iron for trapping and surface phenomena characterisation

Díaz, Andrés; Zafra, A.; Martínez‐Pañeda, Emilio; Alegre, J.M.; Belzunce, F. J.; Cuesta, I.I.

doi:10.1016/j.tafmec.2020.102818

Cited by 23 publications

(7 citation statements)

References 42 publications

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“…In the second part, the influence of each trapping site on the permeation dynamics is investigated with simulations of permeation experiments performed with mhims. In accordance with previous observations [19][20][21][22][23][24], irreversible trapping sites are shown to have an impact on permeation. A definition of reversibility is given in [25]: 'a reversible trap is one at which hydrogen has a short residence time at the temperature of interest with an equivalent low detrapping energy.…”

Section: Introductionsupporting

confidence: 92%

“…The influence of a given trapping site on permeation is linked to its reversibility, which states whether a trapping site containing hydrogen is likely to release its content [19][20][21][22][23][24]. Reversibility as a notion can be used independently of temperature (e.g.…”

Section: Discussionmentioning

confidence: 99%

“…Subsections 4.2 and 4.3 have shown that each trapping site has an effect on diffusivity in a limited temperature range. This has been shown to be caused by the reversibility of the trapping sites [19][20][21][22][23][24]. Usually, trapping sites with a low detrapping energy are considered reversible, as they allow hydrogen to easily detrap.…”

Section: Trapping Sites Reversibilitymentioning

confidence: 99%

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Influence of traps reversibility on hydrogen permeation and retention in Eurofer97

Montupet-Leblond¹,

Hodille²,

Payet³

et al. 2022

Nucl. Fusion

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The presence of three trapping sites in Eurofer97 and the diffusion and trapping parameters obtained in a previous article are confirmed using an additional thermal desorption spectrometry (TDS) experiment. Using these parameters, permeation cycles are simulated using the diffusion-reaction code mhims in order to study the influence of each trapping site on the permeation dynamics. The concept of traps reversibility is used to qualify this influence. The analysis indicates that the reversibility of the trapping sites is a key parameter in diffusion and permeation dynamics, which must be accounted for to get accurate predictions of hydrogen inventory and permeation.

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Section: Introductionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Trapping Sites Reversibilitymentioning

confidence: 99%

See 1 more Smart Citation

Influence of traps reversibility on hydrogen permeation and retention in Eurofer97

Montupet-Leblond¹,

Hodille²,

Payet³

et al. 2022

Nucl. Fusion

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“…It is also interesting to notice that the D L obtained in the softest-more recoveredmicrostructures (QT725-4h, FC845 and FC1050), which lay between 1.01 and 1.16 × 10 −9 m 2 /s, is not far from the diffusivity reported by other authors for pure iron [11,45]. It is clear then that trapping phenomena is minimum in this situation, with lattice diffusion being predominant.…”

Section: Discussionmentioning

confidence: 57%

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Imdad¹,

Zafra²,

Arniella³

et al. 2021

Hydrogen

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It is well known that the presence of hydrogen decreases the mechanical properties of ferritic steels, giving rise to the phenomenon known as hydrogen embrittlement (HE). The sensitivity to HE increases with the strength of the steel due to the increase of its microstructural defects (hydrogen traps), which eventually increase hydrogen solubility and decrease hydrogen diffusivity in the steel. The aim of this work is to study hydrogen diffusivity in a 42CrMo4 steel submitted to different heat treatments—annealing, normalizing and quench and tempering—to obtain different microstructures, with a broad range of hardness levels. Electrochemical hydrogen permeation tests were performed in a modified Devanathan and Stachursky double-cell. The build-up transient methodology allowed the determination of the apparent hydrogen diffusion coefficient, Dapp, and assessment of its evolution during the progressive filling of the microstructural hydrogen traps. Consequently, the lattice hydrogen diffusion coefficient, DL, was determined. Optical and scanning electron microscopy (SEM) were employed to examine the steel microstructures in order to understand their interaction with hydrogen atoms. In general, the results show that the permeation parameters are strongly related to the steel hardness, being less affected by the type of microstructure.

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“…To clarify the effect of hydrogen on the tensile properties of the materials, we should pay attention to the concentration of hydrogen atoms rather than the hydrogen chargin current density. Therefore, we used electrochemical hydrogen permeation experiments t determine the concentration of hydrogen atoms in the different materials at different hy The constant concentration (CC) model was chosen as the hydrogen permeation model [44][45][46]. For the CC model, the theoretical seepage transient current follows the dimensionless Formula (1):…”

Section: Tensile Properties Of Cghaz With Different Heat Inputs At Di...mentioning

confidence: 99%

Hydrogen-Induced Cracking in CGHAZ of Welded X80 Steel under Tension Load

Gou

Xing

Chen

et al. 2023

Metals

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X80 steel is extensively used in hydrogen environments and is susceptible to hydrogen embrittlement (HE). This paper studied the hydrogen-induced cracking (HIC) behavior in the coarse-grained heat-affected zone (CGHAZ) of X80 steel welds, through applying in situ hydrogen-charging tensile experiments, hydrogen permeation experiments, and various surface analysis techniques. It is shown that a few hydrogen atoms can significantly decrease a material’s elongation and reduction of area. When the heat input (HI) was 29.2 kJ/cm, the material had minor sensitivity to hydrogen embrittlement. The tensile fractures were ductile without hydrogen. However, the fracture surface exhibited brittle fracture with hydrogen. With increased HI, the HE fracture showed a transition of intergranular fracture→intergranular and transgranular mixed fracture→transgranular fracture. In the presence of hydrogen, the grain boundaries of elongated strips were prone to the formation of intergranular cracks under a tension load, and the hydrogen embrittlement resistance of the bulk lath bainite (LB) was weak. The hydrogen embrittlement susceptibility of pure granular bainite (GB) was lower. Fine LB and GB composite structures could remarkably inhibit intergranular cracks, giving the steel a superior resistance to hydrogen embrittlement.

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Simulation of hydrogen permeation through pure iron for trapping and surface phenomena characterisation

Cited by 23 publications

References 42 publications

Influence of traps reversibility on hydrogen permeation and retention in Eurofer97

Influence of traps reversibility on hydrogen permeation and retention in Eurofer97

Hydrogen Diffusivity in Different Microstructures of 42CrMo4 Steel

Hydrogen-Induced Cracking in CGHAZ of Welded X80 Steel under Tension Load

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