Journal ArticleDOI
Hydrogen related failure of steels – a new aspect
TLDR
In this paper, the role of hydrogen in reducing ductile crack growth resistance is attributed to the increased creation of vacancies on straining, which is supported by a recent finding of amorphisation associated with crack growth.Citations
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Hydrogen Embrittlement Understood
Ian M. Robertson,Ian M. Robertson,Petros Athanasios Sofronis,Petros Athanasios Sofronis,Akihide Nagao,May L. Martin,Shuai Wang,Shuai Wang,D. W. Gross,Kelly E. Nygren +9 more
TL;DR: The connection between hydrogen-enhanced plasticity and the hydrogen-induced fracture mechanism and pathway is established through examination of the evolved microstructural state immediately beneath fracture surfaces including voids, quasi-cleavage, and intergranular surfaces as discussed by the authors.
Journal ArticleDOI
Hydrogen embrittlement phenomena and mechanisms
TL;DR: In this paper, the relative importance of these mechanisms for different fracture modes and materials are discussed based on detailed fractographic observations and critical experiments, and the evidence supporting various hypotheses, such as those based on hydride formation, hydrogenenhanced decohesion, hydrogen-enhanced localised plasticity, adsorption-induced dislocation emission, and hydrogen-vacancy interactions, are summarised.
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Effect of hydrogen on the fracture behavior of high strength steel during slow strain rate test
TL;DR: In this paper, the effect of hydrogen on the fracture behavior of quenched and tempered AISI 4135 steel at 1450 MPa was investigated by means of slow strain rate tests on smooth and circumferentially-notched round-bar specimens.
Journal ArticleDOI
Hydrogen Embrittlement Understood
Ian M. Robertson,Ian M. Robertson,Petros Athanasios Sofronis,Petros Athanasios Sofronis,Akihide Nagao,May L. Martin,Shuai Wang,Shuai Wang,D. W. Gross,Kelly E. Nygren +9 more
TL;DR: The connection between hydrogen-enhanced plasticity and the hydrogen-induced fracture mechanism and pathway is established through examination of the evolved microstructural state immediately beneath fracture surfaces including voids, quasi-cleavage, and intergranular surfaces as discussed by the authors.
Journal ArticleDOI
The synergistic action and interplay of hydrogen embrittlement mechanisms in steels and iron: Localized plasticity and decohesion
TL;DR: In this paper, a review of the synergistic interplay of hydrogen embrittlement mechanisms in STEEL and IR is presented, with a particular emphasis on the proposal of the novel and unified HELP+HEDE model based on the specific microstructural mapping of the dominant HE mechanisms with implications on the fracture process and resulting hydrogen-assisted fracture modes.
References
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Journal ArticleDOI
Continuum Theory of Ductile Rupture by Void Nucleation and Growth: Part I—Yield Criteria and Flow Rules for Porous Ductile Media
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Effects of hydrogen on the properties of iron and steel
TL;DR: In this paper, the effects of hydrogen on the physical and mechanical properties of iron and steel are reviewed and a new mechanism for the cold work peak for hydrogen in iron is considered.
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The diffusion and trapping of hydrogen in steel
TL;DR: In this paper, the mobility of dissolved hydrogen in an iron lattice having a population of extraordinary, or trapping, sites for hydrogen is analyzed under the assumption of local equilibrium between the mobile and the trapped populations.
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Environmentally Assisted Cracking: Overview of Evidence for an Adsorption-Induced Localised-Slip Process,
TL;DR: In this paper, it was shown that hydrogen-assisted cracking occurs because adsorption facilitates the injection of dislocations from crack tips and thereby promotes the coalescence of cracks with voids ahead of cracks.
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Numerical analysis of hydrogen transport near a blunting crack tip
TL;DR: In this paper, Oriani's equilibrium theory is used to relate the hydrogen in traps (micro-structural defects) to concentration in normal interstitial lattice sites (NILS), and the resulting non-linear transient hydrogen diffusion equations are integrated using a modified backward Euler method.