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Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

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https://www.readbyqxmd.com/read/28607204/the-challenges-of-hydrogen-and-metals
#1
A T Paxton, A P Sutton, M W Finnis
The Royal Society Scientific Discussion Meeting 'The challenges of hydrogen and metals' was held in Carlton House Terrace, London, UK, on 16-18 January 2017. This is the introductory article to the discussion meeting issue which includes contributed papers and seven discussion papers. Here, we introduce the motivation to hold the Meeting and give a brief overview of the contents. We conclude with acknowledgements.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607203/hydrogen-enhanced-cracking-revealed-by-in-situ-micro-cantilever-bending-test-inside-environmental-scanning-electron-microscope
#2
Yun Deng, Tarlan Hajilou, Afrooz Barnoush
To evaluate the hydrogen (H)-induced embrittlement in iron aluminium intermetallics, especially the one with stoichiometric composition of 50 at.% Al, a novel in situ micro-cantilever bending test was applied within an environmental scanning electron microscope (ESEM), which provides both a full process monitoring and a clean, in situ H-charging condition. Two sets of cantilevers were analysed in this work: one set of un-notched cantilevers, and the other set with focused ion beam-milled notch laying on two crystallographic planes: (010) and (110)...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607202/mechanisms-of-hydrogen-embrittlement-in-steels-discussion
#3
Felicity F Dear, Guy C G Skinner
This discussion session interrogated the current understanding of hydrogen embrittlement mechanisms in steels.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607201/hydrogen-transport-and-trapping-from-quantum-effects-to-alloy-design-discussion
#4
Y-S Chen, H Lambert
This discussion session concerned experimental and theoretical investigations of the atomistic properties underlying the energetics and kinetics of hydrogen trapping and diffusion in metallic systems.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607200/hydrogen-effects-in-non-ferrous-alloys-discussion
#5
Mitesh Patel, Miles A Stopher
This is a transcript of the discussion session on the effects of hydrogen in the non-ferrous alloys of zirconium and titanium, which are anisotropic hydride-forming metals. The four talks focus on the hydrogen embrittlement mechanisms that affect zirconium and titanium components, which are respectively used in the nuclear and aerospace industries. Two specific mechanisms are delayed hydride cracking and stress corrosion cracking.This article is part of the themed issue 'The challenges of hydrogen and metals'...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607199/hydrogen-embrittlement-future-directions-discussion
#6
H Lambert, Y-S Chen
The final session of the meeting consisted of a discussion panel to propose future directions for research in the field of hydrogen embrittlement and the potential impact of this research on public policy.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607198/hydrogen-effects-in-corrosion-discussion
#7
Miles A Stopher, E Luke Simpson
This session contained talks on the characterization of hydrogen-enhanced corrosion of steels and nickel-based alloys, emphasizing the different observations across length scales, from atomic-scale spectrographic to macro-scale fractographic examinations.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607197/hydrogen-in-steels-discussion
#8
E Luke Simpson, Mitesh Patel
This session contained talks concerning hydrogen in steels from the point of view of simulation, experiment and industry.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607196/political-economic-and-environmental-concerns-discussion
#9
Guy C G Skinner, Felicity F Dear
This session concerned the political, economic and environmental impact on the hydrogen economy due to hydrogen embrittlement.This article is part of the themed issue 'The challenges of hydrogen and metals'.
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607195/hydrogen-in-ti-and-zr-alloys-industrial-perspective-failure-modes-and-mechanistic-understanding
#10
REVIEW
T P Chapman, D Dye, D Rugg
Titanium is widely used in demanding applications, such as in aerospace. Its strength-to-weight ratio and corrosion resistance make it well suited to highly stressed rotating components. Zirconium has a no less critical application where its low neutron capture cross section and good corrosion resistance in hot water and steam make it well suited to reactor core use, including fuel cladding and structures. The similar metallurgical behaviour of these alloy systems makes it alluring to compare and contrast their behaviour...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607194/solute-hydrogen-and-hydride-phase-implications-on-the-plasticity-of-zirconium-and-titanium-alloys-a-review-and-some-recent-advances
#11
REVIEW
E Conforto, I Guillot, X Feaugas
In this contribution, we propose a review of the possible implications of hydrogen on mechanical behaviour of Zr and Ti alloys with emphasis on the mechanisms of plasticity and strain hardening. Recent advances on the impact of oxygen and hydrogen on the activation volume show that oxygen content hinders creep but hydrogen partially screens this effect. Both aspects are discussed in terms of a locking-unlocking model of the screw dislocation mobility in prismatic slip. Additionally, possible extension of this behaviour is suggested for the [Formula: see text] pyramidal slip...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607193/hydrogen-embrittlement-the-game-changing-factor-in-the-applicability-of-nickel-alloys-in-oilfield-technology
#12
Helmuth Sarmiento Klapper, Jutta Klöwer, Olesya Gosheva
Precipitation hardenable (PH) nickel (Ni) alloys are often the most reliable engineering materials for demanding oilfield upstream and subsea applications especially in deep sour wells. Despite their superior corrosion resistance and mechanical properties over a broad range of temperatures, the applicability of PH Ni alloys has been questioned due to their susceptibility to hydrogen embrittlement (HE), as confirmed in documented failures of components in upstream applications. While extensive work has been done in recent years to develop testing methodologies for benchmarking PH Ni alloys in terms of their HE susceptibility, limited scientific research has been conducted to achieve improved foundational knowledge about the role of microstructural particularities in these alloys on their mechanical behaviour in environments promoting hydrogen uptake...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607192/atomic-level-characterization-in-corrosion-studies
#13
REVIEW
Philippe Marcus, Vincent Maurice
Atomic level characterization brings fundamental insight into the mechanisms of self-protection against corrosion of metals and alloys by oxide passive films and into how localized corrosion is initiated on passivated metal surfaces. This is illustrated in this overview with selected data obtained at the subnanometre, i.e. atomic or molecular, scale and also at the nanometre scale on single-crystal copper, nickel, chromium and stainless steel surfaces passivated in well-controlled conditions and analysed in situ and/or ex situ by scanning tunnelling microscopy/spectroscopy and atomic force microscopy...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607191/hydrogen-enhanced-fatigue-crack-growth-in-steels-and-its-frequency-dependence
#14
Hisao Matsunaga, Osamu Takakuwa, Junichiro Yamabe, Saburo Matsuoka
In the context of the fatigue life design of components, particularly those destined for use in hydrogen refuelling stations and fuel cell vehicles, it is important to understand the hydrogen-induced, fatigue crack growth (FCG) acceleration in steels. As such, the mechanisms for acceleration and its influencing factors are reviewed and discussed in this paper, with a special focus on the peculiar frequency dependence of the hydrogen-induced FCG acceleration. Further, this frequency dependence is debated by introducing some potentially responsible elements, along with new experimental data obtained by the authors...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607190/a-review-of-cohesive-zone-modelling-as-an-approach-for-numerically-assessing-hydrogen-embrittlement-of-steel-structures
#15
REVIEW
L Jemblie, V Olden, O M Akselsen
Simulation of hydrogen embrittlement (HE) requires a coupled approach; on one side, the models describing hydrogen transport must account for local mechanical fields, while, on the other side, the effect of hydrogen on the accelerated material damage must be implemented into the model describing crack initiation and growth. This study presents a review of coupled diffusion and cohesive zone modelling as a method for numerically assessing HE of a steel structure. While the model is able to reproduce single experimental results by appropriate fitting of the cohesive parameters, there appears to be limitations in transferring these results to other hydrogen systems...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607189/hydrogen-enhanced-cracking-studies-on-fe-3wt-si-single-and-bi-crystal-microcantilevers
#16
T Hajilou, Y Deng, N Kheradmand, A Barnoush
Hydrogen (H) enhanced cracking was studied in Fe-3wt%Si by means of in situ electrochemical microcantilever bending test. It was clearly shown that the presence of H causes hydrogen embrittlement (HE) by triggering crack initiation and propagation at the notch where stress concentration is existing. Additionally, the effect of carbon content and the presence of a grain boundary (GB) in the cantilever were studied. It was shown that in the presence of H the effect of carbon atom on pinning the dislocations is reduced...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607188/analysis-of-electro-permeation-of-hydrogen-in-metallic-alloys
#17
A Raina, V S Deshpande, N A Fleck
A reaction-diffusion type modelling framework is presented to analyse both electro-permeation (EP) and thermal desorption spectrometry (TDS) measurements of hydrogen in metallic alloys. It is assumed that the kinetics of hydrogen motion is governed by diffusion through the lattice, along with trapping/detrapping at specific sites such as dislocations, grain boundaries, etc. It is shown that the trapping and detrapping rates are typically much faster than the diffusion rate, and consequently a simplification of the governing equations suffices such that local equilibrium exists between lattice and trapped hydrogen...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607187/hydrogen-related-challenges-for-the-steelmaker-the-search-for-proper-testing
#18
R G Thiessen
The modern steelmaker of advanced high-strength steels has always been challenged with the conflicting targets of increased strength while maintaining or improving ductility. These new steels help the transportation sector, including the automotive sector, to achieve the goals of increased passenger safety and reduced emissions. With increasing tensile strengths, certain steels exhibit an increased sensitivity towards hydrogen embrittlement (HE). The ability to characterize the material's sensitivity in an as-delivered condition has been developed and accepted (SEP1970), but the complexity of the stress states that can induce an embrittlement together with the wide range of applications for high-strength steels make the development of a standardized test for HE under in-service conditions extremely challenging...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607186/alloy-and-composition-dependence-of-hydrogen-embrittlement-susceptibility-in-high-strength-steel-fasteners
#19
S V Brahimi, S Yue, K R Sriraman
High-strength steel fasteners characterized by tensile strengths above 1100 MPa are often used in critical applications where a failure can have catastrophic consequences. Preventing hydrogen embrittlement (HE) failure is a fundamental concern implicating the entire fastener supply chain. Research is typically conducted under idealized conditions that cannot be translated into know-how prescribed in fastener industry standards and practices. Additionally, inconsistencies and even contradictions in fastener industry standards have led to much confusion and many preventable or misdiagnosed fastener failures...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
https://www.readbyqxmd.com/read/28607185/isotopic-tracing-of-hydrogen-transport-and-trapping-in-nuclear-materials
#20
Jacques Chêne, Frantz Martin
Some illustrations of the use of deuterium or tritium for isotopic tracing of hydrogen absorption, transport and trapping in nuclear materials are presented. Isotopic tracing of hydrogen has been shown to be successful for the determination of the boundaries conditions for hydrogen desorption or absorption in a material exposed to a hydrogen source. Also, the unique capabilities of isotopic tracing and related techniques to characterize H interactions with point defects and dislocations acting as moving traps has been demonstrated...
July 28, 2017: Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
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