The effect of hydrogen content and yield strength on the distribution of hydrogen in steel: a diffusion coupled micromechanical FEM study

Hussein, Abdelrahman; Krom, A.H.M.; Dey, Poulumi; Sunnardianto, Gagus Ketut; Moultos, Othonas A.; Walters, Carey L.

doi:10.1016/j.actamat.2021.116799

Cited by 44 publications

(19 citation statements)

References 64 publications

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“…D L;0 was 0.133 mm 2 /s [37,[49][50][51][52]. In bcc iron, the local hydrogen exchange between lattice sites and trapping sites is magnitudes faster than the long-range chemical diffusion [19,32,53]. That fulfils the local equilibrium assumption according to Oriani's theory [32], which is…”

Section: Bulk Diffusion Modellingmentioning

confidence: 78%

“…The estimation according to the Kirchheim criterium gave binding energies between 18.3 and 30.7 kJ/mol. Hence, compared to micro-alloyed AHSS [42,43] DP steels contain mainly shallow hydrogen trapping sites, e.g., trapping sites at dislocations [36,38], lath martensite boundaries [42,43] or in volumes under micro-residual stress [53]. Although the titanium and niobium content in the chemical compositions of the investigated DP steels were not low, deep trapping sites, as they were found in literature for Titanium carbides and Niobium carbides [44,46,64], could not be observed in the measured TDS spectra.…”

Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 99%

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The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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Hydrogen embrittlement (HE) of advanced high-strength steels is a crucial problem in the automotive industry, which may cause time-delayed failure of car body components. Practical approaches for evaluating the HE risk are often partially and contradictive in nature, because of hydrogen desorption during testing and inhomogenous hydrogen distributions in, e.g., notched samples. Therefore, the present work aims to provide fully parametrized and validated bulk diffusion models for three dual phase steels to simulate long-range chemical diffusion, trapping and hydrogen desorption from the surface. With one constant set of parameters, the models are able to predict the temperature dependency of measured Choo-Lee plots as well as the concentration dependency of measured effective diffusion coefficients. Finally, the parametrized and validated bulk diffusion models are applied for studying the role of the current density on the permeation time and the role of coatings as effective diffusion barriers. Graphical abstract

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Section: Bulk Diffusion Modellingmentioning

confidence: 78%

Section: Characterization Of Hydrogen Content and Desorption Energymentioning

confidence: 99%

The role of hydrogen diffusion, trapping and desorption in dual phase steels

et al. 2022

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“…There has been significant advancement in modeling of hydrogen-related phenomena. Most of the work [ 5 , 6 , 7 ] are focused in translating the hydrogen mechanisms and damages in constitutive equations.…”

Section: Introductionmentioning

confidence: 99%

“…In the modern literature [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ] the following main mechanisms of the influence of hydrogen on the service characteristics of structural metals and alloys are considered and discussed hydrogen-enhanced decohesion (HEDE) and hydrogen-enhanced localized plasticity (HELP). Since over a wide range of hydrogen concentrations the enhancement in the mobility of dislocations was detected from very low to high, it can be concluded that the HELP mechanism might be active, but in varying degrees, depending on the concentration of hydrogen in metal.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hydrogen on the Fracture Resistance of Pre-Strained Steam Generator Steel 22K

et al. 2022

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In the paper, experimental studies of the hydrogen and pre-strained effect on fracture resistance of steam generator steel 22K were carried out. Special cylindrical samples were loaded up to fracture under a uniaxial tensile test with different pre-strained degrees and hydrogen charged times of the material. Stress-strain curves «Si–ei» were plotted. The true strain «ei» in the local volume was determined using the method of optical-digital image correlation (ODIC). The results showed that the hydrogen influence is practically absent in the elastic area of strain. The fracture energy of steel 22K decreases under the hydrogen influence and pre-strain in all investigated cases. It is shown that during six months of air exposure, with the 0% pre-strained samples release almost all hydrogen. In pre-strained samples, the hydrogen concentration decreased by 1–3% compared to the initial values. This indicates that they have trapped hydrogen that cannot escape on its own. Hydrogen embrittlement (HE) indexes for 0% pre-strained samples at different levels of hydrogen-charging calculated by the strain and energy approaches are equal to each other. There is a difference in the values of the HE index depending on the hydrogen-charge time for pre-strained samples. This indicates that both strain and strength characteristics of the material, which are integrally taken into account in the energy approach, are sensitive to HE.

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“…However, these modelling studies treat materials as isotropic continuum solids, without resolving the underlying microstructure. A number of icrostructurally-sensitive works have been recently carried out (see, e.g., [27][28][29][30][31][32][33] and Refs. therein), but these are limited to capture the interplay between diffusion and deformation, and do not explicitly simulate fracture.…”

Section: Introductionmentioning

confidence: 99%