Hydrogen transport by dislocations

Tien, J. K.; Thompson, Anthony W.; Bernstein, I. M.; Richards, R. J.

doi:10.1007/bf02644079

Cited by 544 publications

(117 citation statements)

References 34 publications

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“…Hydrogen transported by dislocation gliding towards and across grain and twin interfaces during deformation [27,28] will tend to accumulate at and embrittle those interfaces, leading to either intergranular separation at grain boundaries, or transgranular fracture associated with the twin interfaces. It is noted that these interfaces are also associated with numerous dislocations that play a role as a trapping site of hydrogen.…”

Section: (D) Hydrogen-induced Transgranular Fracturementioning

confidence: 99%

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

et al. 2013

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It is known empirically that the addition of aluminium as a solute in high-Mn austenitic steels dramatically improves their resistance to hydrogen-induced embrittlement. A variety of experimental techniques, including the characterization of trapping sites and high-resolution observation of fracture facets, have been used to reveal the mechanism by which aluminium induces this effect. It is found that transgranular fracture is promoted by the segregation of hydrogen to mechanical twin interfaces and to any -martensite that is induced during deformation. Because aluminium increases the stacking fault energy of austenite, the tendency for mechanical twinning is reduced, and the formation of deformationinduced martensite eliminated. These two effects contribute to the resistance of the aluminium-alloyed steel to hydrogen embrittlement.

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Section: (D) Hydrogen-induced Transgranular Fracturementioning

confidence: 99%

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

et al. 2013

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“…Two main types of hydrogen transport in metals have been proposed: (i) lattice diffusion or random-walk diffusion, described by Troiano [1], Van Leeuwen [2] and Toribio and Kharin [3]; (ii) dislocation sweeping or dislocation dragging, described by Tien et al [4]; Johnson and Hirth [5] and Nair et al [6]. This second mechanism is associated with hydrogen-plasticity interactions.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-plasticity interactions in pearlitic steel: A fractographic and numerical study

Toribio

1996

Materials Science and Engineering: A

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This paper analyzes by numerical methods the plastic zone evolution in the vicinity of a crack tip in a high-strength pearlitic steel subjected to cyclic (fatigue) precracking and posterior hydrogen assisted cracking (HAC). The plastic zone extent is compared with the tearing topography surface (TTS) or hydrogen-assisted micro-damage region in the experiments. Results demonstrate that the TTS depth has no relation with the active plastic zone dimension, i.e., with the size of the only region in which there is dislocation movement, so hydrogen transport cannot be attributed to dislocation dragging, but to random-walk lattice diffusion in which the hydrostatic stress field plays a relevant role.

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“…In their assumption, the combined effect of HELP and the hydrogenenhanced decohesion (HEDE) model [27] play a crucial role in causing the fracture along GBs. According to the HELP framework, the hydrogen atoms -which distribute inside the grains -are transported by moving dislocations [28,29] and then deposited into GBs in conjunction with the dislocations piling-up onto GBs. This process achieves the local stress concentration and hydrogen agglomeration around GBs, which, theoretically, is enough to satisfy the critical condition to operate atomistic decohesion [16,22,26].…”

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confidence: 99%

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

et al. 2018

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Abstract. The role of hydrogen on intergranular (IG) fracture in hydrogen-assisted fatigue crack growth (HAFCG) of a pure iron at low stress intensity was discussed in terms of the microscopic deformation structures near crack propagation paths. The main cause of IG fracture was assumed to be the hydrogen-enhanced dislocation structure evolution and subsequent microvoids formation along the grain boundaries. Additionally, the impact of such IG cracking on the macroscopic FCG rate was evaluated according to the dependency of IG fracture propensity on the hydrogen gas pressure. It was first demonstrated that the increased hydrogen pressure results in the larger area fraction of IG and corresponding faster FCG rate. Moreover, gaseous hydrogen environment also had a positive influence on the FCG rate due to the absence of oxygen and water vapor. The macroscopic crack propagation rate was controlled by the competition process of said positive and negative effects.

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Hydrogen transport by dislocations

Cited by 544 publications

References 34 publications

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

Effect of aluminium on hydrogen-induced fracture behaviour in austenitic Fe–Mn–C steel

Hydrogen-plasticity interactions in pearlitic steel: A fractographic and numerical study

Hydrogen-assisted fatigue crack propagation in a pure BCC iron. Part I: Intergranular crack propagation at relatively low stress intensities

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