Journal ArticleDOI
Hydrogen-enhanced localized plasticity—a mechanism for hydrogen-related fracture
Reads0
Chats0
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
More filters
Journal ArticleDOI
The Effect of Cold Rolling on the Hydrogen Susceptibility of 5083 Aluminum Alloy
TL;DR: In this article, the authors investigated the effect of cold deformation on the cathodic hydrogen charging of 5083 aluminum alloy and found that the deformation process led to an increase of hydrogen susceptibility of this aluminum alloy.
Journal ArticleDOI
Probing the Effect of Hydrogen on Elastic Properties and Plastic Deformation in Nickel Using Nanoindentation and Ultrasonic Methods
Samantha K. Lawrence,Brian P. Somerday,Brian P. Somerday,Mathew Duffy Ingraham,David F. Bahr +4 more
TL;DR: In this article, the authors investigated hydrogen effects on small volume plasticity and elastic stiffness constants of Ni-201 and sonic velocity measurements of bulk Ni single crystals, and revealed a direct correlation between hydrogen-affected elastic properties and plastic deformation in Ni alloys.
Journal ArticleDOI
Effects of 100 ppb dissolved oxygen on low-cycle fatigue behaviors of 316LN austenitic stainless steel in borated and lithiated high temperature water and mechanism behind these effects
TL;DR: In this paper, the effect of dissolved oxygen (DO) on the crack initiation and propagation in borated and lithiated high temperature water were observed, which finally increased the low-cycle fatigue (LCF) life of the 316LN in the water.
Journal ArticleDOI
Hydrogen induced dislocation core reconstruction in bcc tungsten
TL;DR: In this article , the effect of H on screw dislocation in bcc tungsten (W) is shown to be H concentration-dependent, signified by a H-induced transition of SD core structure.
Journal ArticleDOI
Orientation Dependence on Plastic Flow Behavior of Hydrogen-Precharged Micropillars of High-Mn Steel
TL;DR: In this paper, the authors investigated the dependence of grain orientation on the hydrogen embrittlement (HE) characteristics of high-Mn twinning-induced plasticity steels.
References
More filters
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.
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.