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Hydrogen-enhanced localized plasticity—a mechanism for hydrogen-related fracture
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TLDR
In this article, a theory of hydrogen shielding of the interaction of dislocations with elastic stress centres is outlined, which can account for the observed hydrogen-enhanced dislocation mobility.Abstract:
The mechanisms of hydrogen-related fracture are briefly reviewed and a few evaluative statements are made about the stress-induced hydride formation, decohesion, and hydrogen-enhanced localized plasticity mechanisms. A more complete discussion of the failure mechanism based on hydrogen-enhanced dislocation mobility is presented, and these observations are related to measurements of the macroscopic flow stress. The effects of hydrogen-induced slip localization on the measured flow stress is discussed. A theory of hydrogen shielding of the interaction of dislocations with elastic stress centres is outlined. It is shown that this shielding effect can account for the observed hydrogen-enhanced dislocation mobility.read more
Citations
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Influence of hydrogen on the deformation morphology of vanadium (1 0 0) micropillars in the α-phase of the vanadium–hydrogen system
Martin Deutges,Inga Knorr,Christine Borchers,Cynthia A. Volkert,Reiner Kirchheim,Reiner Kirchheim +5 more
TL;DR: In this article, the effect of dissolved hydrogen in a vanadium single crystal was studied using compression tests of micropillars, and it was observed that the shape of the deformed pillars changes with hydrogen concentration.
Journal ArticleDOI
A nanotwinned austenite stainless steel with high hydrogen embrittlement resistance
TL;DR: In this paper, the dynamic plastic deformation (DPD) treatment followed by a proper heat treatment was applied to a nanotwinned 304 steel with a favorable combination of strength and ductility.
Journal ArticleDOI
Quantities and distribution of strain-induced vacancies and dislocations enhanced by hydrogen in iron
Yuri Sugiyama,Kenichi Takai +1 more
TL;DR: The role of hydrogen in the formation behavior of various lattice defects induced by plastic strain in pure iron specimens has been investigated using low-temperature thermal desorption spectroscopy (L-TDS), which can start measurement from −200 °C.
Journal ArticleDOI
Use of existing steel pipeline infrastructure for gaseous hydrogen storage and transport: A review of factors affecting hydrogen induced degradation
TL;DR: In this paper , the authors present a literature overview of the relevant aspects in this consideration, indicating ample scope for further research in all abovementioned aspects, indicating that the take-up of hydrogen by pipeline steel may be mitigated by the addition of gas impurities, i.e. inhibitors, to the gas mixture.
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Numerical simulation of the transient hydrogen trapping process using an analytical approximation of the McNabb and Foster equation
TL;DR: In this paper, an analytical solution for the differential equation of trapping kinetics is proposed, as a generalization of the Oriani's equilibrium relationship, which has been implemented in the Abaqus finite element software and validated by comparison with the one-dimensional kinetic MRE Hydrogen Isotope Inventory Processes Code (HIIPC).
References
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Journal ArticleDOI
Embedded-atom method: Derivation and application to impurities, surfaces, and other defects in metals
Murray S. Daw,Michael I. Baskes +1 more
TL;DR: In this paper, the authors derived an expression for the total energy of a metal using the embedding energy from which they obtained several ground-state properties, such as the lattice constant, elastic constants, sublimation energy, and vacancy-formation energy.
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A new model for hydrogen-assisted cracking (hydrogen “embrittlement”)
TL;DR: A new model for hydrogen-assisted cracking is presented in this article, which explains the observations of decreasing microscopic plasticity and changes of fracture modes with decreasing stress intensities at crack tips during stress-corrosion cracking and HAC of quenched-and tempered steels.
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Equilibrium aspects of hydrogen-induced cracking of steels
R.A. Oriani,P.H. Josephic +1 more
TL;DR: In this paper, the threshold pressures, p ∗, of hydrogen and of deuterium gases necessary to cause crack propagation in AISI 4340 steel of 250 ksi yield strength, were determined as functions of plane-strain stress intensity factor K at room temperature.
Journal ArticleDOI
A theory of the fracture of metals
TL;DR: In this paper, a theory of the fracture of metals is presented, which is based on the theory of fracture theory of metal fracture, and it is proved that the theory is correct.
Journal ArticleDOI
Hydrogen embrittlement of α titanium: In situ tem studies
TL;DR: In this paper, the effect of hydrogen on fracture in the h.c.p. α Ti-4 wt % Al alloy and the role of titanium hydride in the fracture process have been studied by deforming samples in situ in a highvoltage electron microscope equipped with an environmental cell.