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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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Experimental verification of the hydrogen concentration around a crack tip using spot X-ray diffraction
TL;DR: In this paper, the authors employed X-ray diffraction using collimated X-rays to quantitatively evaluate the local hydrogen concentration behavior in metals, and demonstrated that hydrogen concentrates in the vicinity of the crack, i.e., at the elastic-plastic boundary.
Journal ArticleDOI
Towards the prediction of hydrogen–induced crack growth in high–graded strength steels
TL;DR: In this paper, a hydrogen-induced cracking methodology incorporating the fully coupled problems of elastoplastic deformation and hydrogen transport within cohesive interface elements framework to predict ductile tearing in high strength steels is presented.
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Influence of interactions between hydrogen and (101¯2) twin boundary on hydrogen embrittlement in α-Ti
TL;DR: In this article, first-principles calculations with the Pseudopotential Plane-wave method within the framework of the Rice-Wang thermodynamic model were performed to investigate the embrittlement effects induced by additional hydrogen in detail by means of first principles calculations.
Journal ArticleDOI
An investigation of the effect of hydrogen on ductile fracture using a unit cell model
TL;DR: In this article, the effect of hydrogen on the ductility of metals is studied by incorporating the hydrogen diffusion process and the hydrogen enhanced localized plasticity (HELP) into a finite element program.
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.
Journal ArticleDOI
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.