Crack and blister initiation and growth in purified iron due to hydrogen loading

Tiegel, Marie C.; Martin, May L.; Lehmberg, Annegret K.; Deutges, Martin; Borchers, C.; Kirchheim, R.

doi:10.1016/j.actamat.2016.05.034

Cited by 107 publications

(56 citation statements)

References 39 publications

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“…Given that the overall size (grain size) of the MD bicrystal models is quite limited (i.e., nanometer scale) in our study, the average hydrogen concentration in the MD bicrystal 6 models should be served as a reference variable. The values of the hydrogen concentrations in the models here appear to be high, but should still be comparable to those in the experiments (Nagumo, 2016;Tiegel et al, 2016) by further considering that the values of hydrogen contents in metals as reported by the experiments in many cases are likely to be those hydrogen atoms which are diffusible in the material. Because of the application of periodic boundary condition to all three dimensions, two identical GBs were included in the bicrystal model, as shown in Fig.…”

Section: Molecular Dynamics (Md) Tensile Simulation With Large Bicryssupporting

confidence: 80%

Hydrogen embrittlement controlled by reaction of dislocation with grain boundary in alpha-iron

Wan

Geng

Ishii

et al. 2019

International Journal of Plasticity

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Hydrogen atoms absorbed by metals in hydrogen-containing environments can lead to the premature fracture of the metal components used in load-bearing conditions. Since metals used in practice are mostly polycrystalline, grain boundaries (GBs) can play an important role in hydrogen embrittlement of metals. Here we show that the reaction of GBs with lattice dislocations is a key component in hydrogen embrittlement mechanism for polycrystalline metals. We use atomistic modeling methods to investigate the mechanical response of GBs in alpha-iron with various hydrogen concentrations.Analysis indicates that dislocations impingement and emission on the GB can provoke it to locally transform into an activated state with a more disordered atomistic structure, and introduce a local stress concentration. The activation of the GB segregated with hydrogen atoms can greatly facilitate decohesion of the GB. We propose a hydrogen embrittlement model that can give better explanation of many experimental observations.

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Section: Molecular Dynamics (Md) Tensile Simulation With Large Bicryssupporting

confidence: 80%

Hydrogen embrittlement controlled by reaction of dislocation with grain boundary in alpha-iron

Wan

Geng

Ishii

et al. 2019

International Journal of Plasticity

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“…9 a). The surfaces of voids or inclusions that are inevitably present even in high-purity iron are known to be the point of origin of crack and blister formation after hydrogen loading of iron [47]. It is most probable that a void like the one shown in Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Microstructure and mechanical properties of medium-carbon steel bonded on low-carbon steel by explosive welding

et al. 2016

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“…Hydrogen (H) bubble formation, and the consequent hydrogen embrittlement it often results, posts a great threat to the structural integrity and mechanical properties of metals, promoting extensive studies of it over the years. [1][2][3][4] Several mechanisms, including "loop punching" and "vacancy clustering", have been proposed to explain the hydrogen bubble growth. [4] While these mechanisms are quite distinct in nature, they all require a nucleation process for the respective hydrogen bubble growth to occur.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen bubble nucleation by self-clustering: density functional theory and statistical model studies using tungsten as a model system

Hou¹,

Kong²,

Sun³

et al. 2018

Nucl. Fusion

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Low-energy hydrogen irradiation is known to induce bubble formation in tungsten, while its atomistic mechanisms remain little understood. Using first-principles calculations and statistical models, we studied the self-clustering behavior of hydrogen in tungsten. Unlike previous speculations that hydrogen self-clusters are energetically unstable owing to the general repulsion between two hydrogens, we demonstrated that hydrogen self-cluster becomes more favorable as the cluster size increases. We found that hydrogen atoms would form two-dimensional platelet-like structures along {100} planes. These hydrogen self-clustering behaviors can be quantitative understood by the competition between long-ranged elastic attraction and local electronic repulsion. Further statistical analysis showed that there exists a critical hydrogen concentration above which hydrogen self-clusters are thermodynamically stable and kinetically feasible. Based on this critical hydrogen concentration, the plasma loading conditions under which hydrogen self-clusters form were predicted. Our predictions showed excellent agreement with experimental results of hydrogen bubble formation in tungsten exposed to low-energy hydrogen irradiation. Finally, we proposed a possible mechanism for the hydrogen bubble nucleation via hydrogen self-clustering. This work provides mechanistic insights and quantitative models towards understanding of plasma-induced hydrogen bubble formation in plasma-facing tungsten.

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Crack and blister initiation and growth in purified iron due to hydrogen loading

Cited by 107 publications

References 39 publications

Hydrogen embrittlement controlled by reaction of dislocation with grain boundary in alpha-iron

Hydrogen embrittlement controlled by reaction of dislocation with grain boundary in alpha-iron

Microstructure and mechanical properties of medium-carbon steel bonded on low-carbon steel by explosive welding

Hydrogen bubble nucleation by self-clustering: density functional theory and statistical model studies using tungsten as a model system

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