The synergistic action and interplay of hydrogen embrittlement mechanisms in steels and iron: Localized plasticity and decohesion

Djukic, Milos B.; Bakić, Gordana; Zeravcic, Vera Sijacki; Sedmak, Aleksandar; Rajičić, Bratislav

doi:10.1016/j.engfracmech.2019.106528

Cited by 402 publications

(136 citation statements)

References 213 publications

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“…Then, hydrogen aggregated at various interfaces reduced the cohesive strength of these interfaces according to the HEDE model. The interaction of HELP model and HEDE model, first HELP model followed by HEDE model, leads to HE, as noticed in Figure B. Quasi‐cleavage fracture in Figure C proves the role of the HEDE model .…”

Section: Discussionmentioning

confidence: 73%

Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests

Zheng

Zhang

Shi

et al. 2019

Fatigue Fract Eng Mat Struct

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Hydrogen‐induced degradation of X80 pipeline steel was investigated through a high strain rate tensile test (2 × 10−4/s) with interposed unloading, reloading, aging at 30°C, or annealing at 200°C with or without hydrogen charging. The results indicated that plasticity degradation does not occur in the hydrogen‐precharged specimens; however, hydrogen embrittlement occurs in the reloading stage when the specimens are charged with hydrogen in the unloading stage after applying a prestrain. Interposed aging at 30°C or annealing at 200°C can also increase the degradation. It indicates that the hydrogen traps caused by the strain along with hydrogen charging are the major source of dislocations. The formation of a hydrogen atmosphere around mobile dislocations, which is related to the rates of hydrogen diffusion and dislocation movement, plays an important role in the degradation process. Both pinning and depinning of dislocations affect plasticity degradation.

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Section: Discussionmentioning

confidence: 73%

Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests

Zheng

Zhang

Shi

et al. 2019

Fatigue Fract Eng Mat Struct

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“…However, the hydrogen-annealed ingot became brittle so that many cracks appeared near the indentation marks after indenting, indicating that a simple milling method could be appreciable for powder fabrication. Based on the hydrogen-enhanced decohesion mechanism, the absorbed hydrogen causes not only a decrease in bonding strength of the lattice but an increase in brittleness as well, as a result of the accumulation of the absorbed hydrogen atoms at crack tips [26][27][28]. As a result, the absorbed hydrogen gets the BCC HEA ingot weakened to pulverization [36].…”

Section: Resultsmentioning

confidence: 99%

“…The loss in strength of metals, when exposed to hydrogen, can be explained by the hydrogen-enhanced decohesion mechanism [26,27]. It is known that crack can be initiated and even propagated by the localized stress, induced by hydrogen absorption [28]. Among the HEAs, FCC HEAs are reported to have high hydrogen-embrittlement resistance, but BCC HEAs are not studied well yet [29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Spherical V-Nb-Mo-Ta-W High-Entropy Alloy Powder Using Hydrogen Embrittlement and Spheroidization by Thermal Plasma

Lee

Park

et al. 2019

Metals

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V-Nb-Mo-Ta-W high-entropy alloy (HEA), one of the refractory HEAs, is considered as a next-generation structural material for ultra-high temperature uses. Refractory HEAs have low castability and machinability due to their high melting temperature and low thermal conductivity. Thus, powder metallurgy becomes a promising method for fabricating components with refractory HEAs. Therefore, in this study, we fabricated spherical V-Nb-Mo-Ta-W HEA powder using hydrogen embrittlement and spheroidization by thermal plasma. The HEA ingot was prepared by vacuum arc melting and revealed to have a single body-centered cubic phase. Hydrogen embrittlement which could be achieved by annealing in a hydrogen atmosphere was introduced to get the ingot pulverized easily to a fine powder having an angular shape. Then, the powder was annealed in a vacuum atmosphere to eliminate the hydrogen from the hydrogenated HEA, resulting in a decrease in the hydrogen concentration from 0.1033 wt% to 0.0003 wt%. The angular shape of the HEA powder was turned into a spherical one by inductively-coupled thermal plasma, allowing to fabricate spherical V-Nb-Mo-Ta-W HEA powder with a d 50 value of 28.0 µm.

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“…Hydrogen embrittlement (HE) is a direct consequence of a critical local hydrogen concentration in a metallic material. There are two main mechanisms of hydrogen-assisted rupture [7][8][9]: -HEDE (Hydrogen-Enhanced DEcohesion); -HELP (Hydrogen-Enhanced Localised Plasticity). The hypothesis of the HEDE mechanism is based on the favoring of the formation of microcracks following the reduction of the cohesion of the metal network, that is to say on the weakening of the inter-atomic bonds, following a high concentration of hydrogen in crack tip.…”

Section: Introductionmentioning

confidence: 99%

“…High temperature hydrogen corrosion occurs which destroys the material of the structural elements. Many studies have been devoted to the problem of high temperature hydrogen corrosion of metal structures [7][8][9][10]. This process is called high temperature hydrogen corrosion.…”

Section: Introductionmentioning

confidence: 99%

Finite Element Modeling of the Behavior of a Hollow Cylinder in a Hydrogen-Containing Environment

Lakhdari

Bubnov

Seddak

et al. 2019

Frattura Ed Integrità Strutturale

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The synergistic action and interplay of hydrogen embrittlement mechanisms in steels and iron: Localized plasticity and decohesion

Cited by 402 publications

References 213 publications

Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests

Effects of hydrogen on the mechanical response of X80 pipeline steel subject to high strain rate tensile tests

Synthesis of Spherical V-Nb-Mo-Ta-W High-Entropy Alloy Powder Using Hydrogen Embrittlement and Spheroidization by Thermal Plasma

Finite Element Modeling of the Behavior of a Hollow Cylinder in a Hydrogen-Containing Environment

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