Equilibrium and kinetic studies of the hydrogen-assisted cracking of steel

Oriani, R. A.; Josephic, P.H.

doi:10.1016/0001-6160(77)90126-2

Cited by 263 publications

(66 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Among several mechanisms proposed for hydrogen embrittlement (HE) of metals, hydrogen-enhanced decohesion (HEDE) [4][5][6] and hydrogen-enhanced local plasticity (HELP) 2,7,8 have gained acceptance as the two most viable for stable phases. Material degradation via the formation of brittle hydride phases, 9 possibly stabilized by local stresses, 10 is also a viable mechanism but has not been found to be relevant for iron, 1 which is the material of interest in this work.…”

Section: Introductionmentioning

confidence: 99%

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations

et al. 2008

View full text Add to dashboard Cite

We present an off-lattice, on-the-fly kinetic Monte Carlo (KMC) model for simulating stress-assisted diffusion and trapping of hydrogen by crystalline defects in iron. Given an embedded atom (EAM) potential as input, energy barriers for diffusion are ascertained on the fly from the local environments of H atoms. To reduce computational cost, on-the-fly calculations are supplemented with precomputed strain-dependent energy barriers in defect-free parts of the crystal. These precomputed barriers, obtained with high-accuracy density functional theory calculations, are used to ascertain the veracity of the EAM barriers and correct them when necessary. Examples of bulk diffusion in crystals containing a screw dipole and vacancies are presented. Effective diffusivities obtained from KMC simulations are found to be in good agreement with theory. Our model provides an avenue for simulating the interaction of hydrogen with cracks, dislocations, grain boundaries, and other lattice defects, over extended time scales, albeit at atomistic length scales.

show abstract

Section: Introductionmentioning

confidence: 99%

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations

et al. 2008

View full text Add to dashboard Cite

show abstract

“…It draws engineers' attention since it can cause catastrophic failure of metallic structures that serve in a H-containing environment. Several different mechanisms have been developed, and the most common ones are hydrogenenhanced localized plasticity (HELP) [3][4][5][6][7][8], hydrogenenhanced decohesion (HEDE) [9][10][11][12], adsorptioninduced dislocation emission (AIDE) [13], hydrogenenhanced vacancy production [14,15], hydrogeninduced phase transformation [16][17][18] etc. These mechanisms describe the HE effect in terms of different aspects ranging from chemical bonding up to microstructure level.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study

et al. 2018

View full text Add to dashboard Cite

Abstract. Fatigue crack growth (FCG) behavior of a Fe-3wt.%Si ferritic alloy under different environmental conditions using in-situ electrochemical (cathodic) hydrogen (H) charging has been investigated. Three frequencies have been applied. Results clearly show that the FCG rate increased by a factor spanning from 20 to 1000 times, depending on the loading frequencies, when compared to the reference test in air. Lower frequency leads to higher FCG rate. A comprehensive fractographic analysis was carried out: the area fraction of different fracture surface features was measured and taken into statistical analysis. Based on these investigations, the possible mechanisms of H-enhanced FCG are discussed. Similar tests in high-pressure H gas from other studies were also compared and discussed. These results give a preliminary understanding of H effect in fatigue crack propagation procedure in ferritic alloys.

show abstract

“…[1][2][3][4][5][6][7] The models so far proposed stand on either of two major viewpoints, brittle or ductile in nature. The operating one may differ depending on the situation, but substantial findings have revealed concerns of plasticity in some specific ways.…”

Section: Introductionmentioning

confidence: 99%

Conformity between Mechanics and Microscopic Functions of Hydrogen in Failure

Nagumo

2012

ISIJ Int.

View full text Add to dashboard Cite

Conformity between macro-mechanics and microscopic functions of hydrogen in failure is reviewed in reference to some models of hydrogen embrittlement (HE), focusing on the role of plasticity. Plastic strain localization, a characteristic feature of HE, is consistent with the hydrogen-enhanced creation of vacancies during plastic deformation. Constitutive relations that take into account the presence of voids describe well the ductile fracture process in HE. The effect of hydrogen on increasing the density of strain-induced vacancies likely promotes plastic instability and decreases ductile crack growth resistance, thus leading to enhanced shear localization and a premature failure.

show abstract

Equilibrium and kinetic studies of the hydrogen-assisted cracking of steel

Cited by 263 publications

References 15 publications

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations

Effect of atomic scale plasticity on hydrogen diffusion in iron: Quantum mechanically informed and on-the-fly kinetic Monte Carlo simulations

Hydrogen-assisted fatigue crack growth in ferritic steels – a fractographic study

Conformity between Mechanics and Microscopic Functions of Hydrogen in Failure

Contact Info

Product

Resources

About