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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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Hydrogen-induced change in core structures of {110}[111] edge and {110}[111] screw dislocations in iron.
TL;DR: The screw dislocation and hydrogen interaction in body-centred cubic iron is found to be not mainly due to the change of elastic modulus, but the variation of dislocation core structure.
Journal ArticleDOI
An insight into PWR primary water SCC mechanisms by comparing surface and crack oxidation
TL;DR: In this article, surface, crack flank, and crack tip oxides were analyzed and compared by high-resolution characterization, including oxidation state mapping, revealing the effects of local water chemistry and applied stress.
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Mechanism of hydrogen absorption during the exposure of alloy 600-like single-crystals to PWR primary simulated media
TL;DR: In this article, the authors investigated the mechanism responsible for hydrogen absorption in Alloy 600 exposed to PWR primary water in order to evaluate the possible role of hydrogen in the stress corrosion cracking (SCC) of this alloy exposed to these environmental conditions.
Journal ArticleDOI
Numerical analysis of the interaction of solute hydrogen atoms with the stress field of a crack
TL;DR: In this paper, the effect of mobile interstitial hydrogen on the deformation of metals and alloys in the case when hydrogen is in equilibrium with local stresses is studied by calculating the hydrogen atmosphere around a stationary crack tip in a linearly elastic isotropic material loaded in mode I plane strain conditions.
Journal ArticleDOI
Thermal desorption analysis of hydrogen in non-hydrogen-charged rolling contact fatigue-tested 100Cr6 steel
TL;DR: Thermal desorption analysis (TDA) using two experimental set-ups has been used to measure the hydrogen concentration in non-hydrogen-charged bearings over increasing RCF test durations for the first time, showing evidence for a relationship between hydrogen concentration and either the formation or the acceleration of WECs is shown in the rollers.
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.
Journal ArticleDOI
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.