Enumeration of the hydrogen-enhanced localized plasticity mechanism for hydrogen embrittlement in structural materials

Martin, May L.; Dadfarnia, Mohsen; Nagao, Akihide; Wang, Shuai; Sofronis, Petros

doi:10.1016/j.actamat.2018.12.014

Cited by 370 publications

(101 citation statements)

References 141 publications

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“…According to this behavior, it is possible to say that the mechanism in the SCC process was hydrogen-enhanced localized plasticity (HELP), which improves the movement of dislocations because they are surrounded by atomic hydrogens, facilitating plastic deformation in a localized way. According to Martin et al [23], the hydrogen-enhanced localized plasticity (HELP) mechanism as a viable mechanism of hydrogen embrittlement.…”

Section: Surface Fracture After Ssrtmentioning

confidence: 99%

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Galván-Martínez

Orozco-Cruz

Carmona-Hernandez

et al. 2019

Metals

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The effect of different cathodic potentials applied to the X70 pipeline steel immersed in acidified and aerated synthetic soil solution under stress using a slow strain rate test (SSRT) and electrochemical impedance spectroscopy (EIS) was studied. According to SSRT results and the fracture surface analysis by scanning electron microscopy (SEM), the steel susceptibility to stress corrosion cracking (SCC) increased as the cathodic polarization increased (Ecp). This behavior is attributed to the anodic dissolution at the tip of the crack and the increment of the cathodic reaction (hydrogen evolution) producing hydrogen embrittlement. Nevertheless, when the Ecp was subjected to the maximum cathodic potential applied (−970 mV), the susceptibility decreased; this behavior is attributed to the fact that the anodic dissolution was suppressed and the process of the SCC was dominated only by hydrogen embrittlement (HE). The EIS results showed that the cathodic process was influenced by the mass transport (hydrogen diffusion) due to the steel undergoing so many changes in the metallic surface as a result of the applied strain that it generated active sites at the surface.

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Section: Surface Fracture After Ssrtmentioning

confidence: 99%

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Galván-Martínez

Orozco-Cruz

Carmona-Hernandez

et al. 2019

Metals

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“…Although the hydrogen atmosphere diffused outside of the specimens in the subsequent aging stage, degradation still occurred during the reloading stage, as observed in Figure C. This degradation is mainly attributed to the HELP model rather than the HEDE model since hydrogen escaped before reloading . Annealing at 200°C in the unloading stage pinned the mobile dislocations, due to the Cottrell atmosphere.…”

Section: Discussionmentioning

confidence: 93%

“…The new dislocation moved so fast that the hydrogen atmosphere cannot form around the mobile dislocations at this strain rate. According to the HELP model, hydrogen atmosphere formation is a prerequisite for the HELP model . Therefore, no degradation occurs under this condition, as shown in Figure A.…”

Section: Discussionmentioning

confidence: 99%

“…According to the HELP model, hydrogen atmosphere formation is a prerequisite for the HELP model. 53 Therefore, no degradation occurs under this condition, as shown in Figure 8A. Of course, the HEDE model may play some roles in fracture, but the HEDE model is very weak because hydrogen did not segregate at the interface.…”

Section: Hydrogen-induced Degradation Modelmentioning

confidence: 92%

“…This degradation is mainly attributed to the HELP model rather than the HEDE model since hydrogen escaped before reloading. 53 Annealing at 200°C in the unloading stage pinned the mobile dislocations, due to the Cottrell atmosphere. During the subsequent reloading, new dislocations grew around the pinned dislocations, then depinning of dislocations occurred with increasing stress that further aggravated the localized slip.…”

Section: Hydrogen-induced Degradation Modelmentioning

confidence: 99%

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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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Scale Transition in Finite Element Simulations of Hydrogen–Plasticity Interactions

Charles¹,

Nguyen²,

Ardon³

et al. 2019

Mechanics and Physics of Solids at Micro‐ and Nano‐Scales

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Enumeration of the hydrogen-enhanced localized plasticity mechanism for hydrogen embrittlement in structural materials

Cited by 370 publications

References 141 publications

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

Corrosion Study of Pipeline Steel under Stress at Different Cathodic Potentials by EIS

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

Scale Transition in Finite Element Simulations of Hydrogen–Plasticity Interactions

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