Journal ArticleDOI
Numerical simulations of hydrogen-dislocation interactions in fcc stainless steels. . part I: hydrogen-dislocation interactions in bulk crystals
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TLDR
In this paper, a numerical simulation method for the coupling between stress and hydrogen diffusion is proposed, based on the diffusion equation including a hydrostatic stress gradient term, and on a discretisation of the hydrogen concentration field.About:
This article is published in Acta Materialia.The article was published on 2002-04-02. It has received 119 citations till now. The article focuses on the topics: Dislocation & Hydrogen.read more
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
Recent developments in the study of hydrogen embrittlement: Hydrogen effect on dislocation nucleation
Afrooz Barnoush,Horst Vehoff +1 more
TL;DR: In this paper, the intrinsic complexities of the experimental examination of hydrogen embrittlement are discussed and an experimental approach, in situ electrochemical nanoindentation, is proposed and performed on different materials.
Journal ArticleDOI
Grain size and grain-boundary effects on diffusion and trapping of hydrogen in pure nickel
Abdelali Oudriss,Jordi Creus,J. Bouhattate,Egle Conforto,C. Berziou,C. Savall,Xavier Feaugas +6 more
TL;DR: In this article, the effect of grain size on hydrogen diffusion and trapping mechanisms was investigated for a wide range of grain sizes of non-textured pure nickel, and the effects of grain boundaries on different defects and trapping sites stored in the GBs, and their consequences on hydrogen transport and segregation.
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
Enumeration of the Hydrogen-Enhanced Localized Plasticity Mechanism for Hydrogen Embrittlement in Structural Materials
May L. Martin,May L. Martin,May L. Martin,Mohsen Dadfarnia,Mohsen Dadfarnia,Mohsen Dadfarnia,Akihide Nagao,Akihide Nagao,Shuai Wang,Shuai Wang,Shuai Wang,Petros Athanasios Sofronis,Petros Athanasios Sofronis +12 more
TL;DR: A review of recent experimental evidence and simulation results enumerating the development of the hydrogen-enhanced localized plasticity (HELP) mechanism as a viable hydrogen embrittlement mechanism for structural materials is presented in this article.
References
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Journal ArticleDOI
The Determination of the Elastic Field of an Ellipsoidal Inclusion, and Related Problems
TL;DR: In this paper, it is shown that to answer several questions of physical or engineering interest, it is necessary to know only the relatively simple elastic field inside the ellipsoid.
Journal ArticleDOI
Hydrogen-enhanced localized plasticity—a mechanism for hydrogen-related fracture
TL;DR: 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.
Journal ArticleDOI
Ductile versus brittle behaviour of crystals
James R. Rice,Robb Thomson +1 more
TL;DR: In this article, a necessary criterion for brittle fracture in crystals is established, in terms of the spontaneous emission of dislocations from an atomically sharp cleavage crack, and the stability of a sharp crack against emission of a blunting dislocation for a number of crystals and crystal types in two dimensions and the energy to form a stable loop of dislocation from the crack tip in three dimensions.
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
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.