Influence of electrochemical hydrogenation parameters on microstructures prone to hydrogen-induced cracking

Cauwels, Margo; Depraetere, Robin; Waele, Wim De; Hertelé, Stijn; Depover, Tom; Verbeken, Kim

doi:10.1016/j.jngse.2022.104533

Cited by 21 publications

(8 citation statements)

References 51 publications

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“…The pipe has an outside diameter of 1016 mm and a measured wall thickness of 15.8 mm. A more detailed microstructural characterization of the tested material can be found in Cauwels et al [40]. Smooth and double-notched axisymmetric tensile specimens were extracted from the pipe, with the loading axis oriented in the longitudinal (L) direction (Figure 2).…”

Section: Methodsmentioning

confidence: 99%

Influence of stress triaxiality on hydrogen assisted ductile damage in an X70 pipeline steel

Depraetere

Waele

Cauwels

et al. 2023

Materials Science and Engineering: A

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Section: Methodsmentioning

confidence: 99%

Influence of stress triaxiality on hydrogen assisted ductile damage in an X70 pipeline steel

Depraetere

Waele

Cauwels

et al. 2023

Materials Science and Engineering: A

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“…The chemical composition is given in Table 1 . For a more detailed micro-structural characterization of the material, the reader is referred to Cauwels et al [ 35 ].…”

Section: Experimental Summarymentioning

confidence: 99%

Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

et al. 2023

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Hydrogen can degrade the mechanical properties of steel components, which is commonly referred to as “hydrogen embrittlement” (HE). Quantifying the effect of HE on the structural integrity of components and structures remains challenging. The authors investigated an X70 pipeline steel through uncharged and hydrogen-charged (notched) tensile tests. This paper presents a combination of experimental results and numerical simulations using a micro-mechanics-inspired damage model. Four specimen geometries and three hydrogen concentrations (including uncharged) were targeted, which allowed for the construction of a fracture locus that depended on the stress triaxiality and hydrogen concentration. The multi-physical finite element model includes hydrogen diffusion and damage on the basis of the complete Gurson model. Hydrogen-Assisted degradation was implemented through an acceleration of the void nucleation process, as supported by experimental observations. The damage parameters were determined through inverse analysis, and the numerical results were in good agreement with the experimental data. The presented model couples micro-mechanical with macro-mechanical results and makes it possible to evaluate the damage evolution during hydrogen-charged mechanical tests. In particular, the well-known ductility loss due to hydrogen was captured well in the form of embrittlement indices for the different geometries and hydrogen concentrations. The limitations of the damage model regarding the stress state are discussed in this paper.

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“…The problem of a hydrogen-induced reduction in the mechanical properties of steel has been extensively studied [19,20]. So far, several hydrogen embrittlement (HE) mechanisms have been proposed, including the Hydrogen Pressure Theory [21], Weak Bond Theory (HEDE) [22], Reduced Surface Energy Theory [23], Promoted Local Plastic Deformation Theory (HELP) [24], and Plastic Deformation Suppression Theory [25], etc.…”

Section: Introductionmentioning

confidence: 99%

Effects of Alloying Element on Hydrogen Adsorption and Diffusion on α-Fe(110) Surfaces: First Principles Study

Zhang,

Jiang

et al. 2024

Metals

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Based on first principles density functional theory (DFT) methods, this study employed the Cambridge Serial Total Energy Package (CASTEP) module within Materials Studio (MS) software under the generalized gradient approximation to investigate the adsorption, diffusion behavior, and electronic properties of hydrogen atoms on α-Fe(110) and α-Fe(110)-Me (Mn, Cr, Ni, Mo) surfaces, including calculations of their adsorption energies and density of states (DOS). The results demonstrated that doping with alloy atoms Me increased the physical adsorption energy of H2 molecules on the surface. Specifically, Mo doping elevated the adsorption energy from −1.00825 eV to −0.70226 eV, with the largest relative change being 30.35%. After doping with Me, the chemical adsorption energy of two hydrogen atoms does not change significantly, among which doping with Cr results in a decrease in the chemical adsorption energy. Building on this, further analysis of the chemical adsorption of single atoms on the surface was conducted. By comparing the adsorption energy and the bond length between a hydrogen atom and iron/dopant metal atom, it was found that Mo doping has the greatest impact, increasing the bond length by 58.58%. Analysis of the DOS functions under different doping conditions validated the interaction between different alloy elements and H atoms. Simultaneously, simulations were carried out on the energy barrier crossed by H atoms diffusing into the metal interior. The results indicate that Ni doping facilitates the diffusion of H atoms, while Cr, Mn, and Mo hinder their diffusion, with Mo having the most significant effect, where its barrier is 21.88 times that of the undoped surface. This conclusion offers deep insights into the impact of different doping elements on hydrogen adsorption and diffusion, aiding in the design of materials resistant to hydrogen embrittlement.

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Influence of electrochemical hydrogenation parameters on microstructures prone to hydrogen-induced cracking

Cited by 21 publications

References 51 publications

Influence of stress triaxiality on hydrogen assisted ductile damage in an X70 pipeline steel

Influence of stress triaxiality on hydrogen assisted ductile damage in an X70 pipeline steel

Modeling of Hydrogen-Charged Notched Tensile Tests of an X70 Pipeline Steel with a Hydrogen-Informed Gurson Model

Effects of Alloying Element on Hydrogen Adsorption and Diffusion on α-Fe(110) Surfaces: First Principles Study

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