Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens

Deng, Yun; Barnoush, Afrooz

doi:10.1016/j.actamat.2017.09.057

Cited by 98 publications

(41 citation statements)

References 47 publications

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“…Therefore it cannot be fully understood by only studying a small number. Small scale tests such as nanoindentation (Nibur et al, 2006;Barnoush and Vehoff, 2010) and microcantilever bending Deng and Barnoush, 2018) in hydrogen environments provide essential new insight. In these experiments, the global load-displacement curve is recorded, as well as dislocation pileups and plastic localisation by microscopy techniques.…”

Section: Experimental Evidencementioning

confidence: 99%

Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials

Cocks

Tarleton

2019

Journal of the Mechanics and Physics of Solids

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In an attempt to bridge the gap between atomistic and continuum plasticity simulations of hydrogen in iron, we present three dimensional discrete dislocation plasticity simulations incorporating the hydrogen elastic stress and a hydrogen dependent dislocation mobility law. The hydrogen induced stress is incorporated following the formulation derived by Gu and El-Awady (2018) which here we extend to a finite boundary value problem, a microcantilever beam, via the superposition principle. The hydrogen dependent mobility law is based on first principle calculations by Katzarov et al. (2017) and was found to promote dislocation generation and enhance slip planarity at a bulk hydrogen concentration of 0.1 appm; which is typical for bcc materials. The hydrogen elastic stress produced the same behaviour, but only when the bulk concentration was extremely high. In a microcantilever, hydrogen was found to promote dislocation activity which lowered the flow stress and generated more pronounced slip steps on the free surfaces. These observations are consistent with the hydrogen enhanced localized plasticity (HELP) mechanism, and it is concluded that both the hydrogen elastic stress and hydrogen increased dislocation mobility are viable explanations for HELP. However it is the latter that dominates at the low concentrations typically found in bcc metals.

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Section: Experimental Evidencementioning

confidence: 99%

Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials

Cocks

Tarleton

2019

Journal of the Mechanics and Physics of Solids

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“…Описанные методы и приемы опробованы и использовались на макрооднородных монокристаллических, аморфных, композитных материалах, высокоэнтропийных и интерметаллических сплавах [119,163,164], пленочных керамических покрытиях (как для определения их собственных свойств, так и энергии адгезии к подложке) [193][194][195]. В [196][197][198] этими методами определяли условия перехода от вязкого к хрупкому разрушению (в частности, температуру и размеры пластической зоны в вершине трещины), а в [199] -закономерности водородного охрупчивания.…”

Section: разрушение в микро- субмикрои наношкалеunclassified

Наноиндентирование И Механические Свойства Материалов В Субмикро- И Наношкале. Недавние Результаты И Достижения (О Б З О Р)

Головин¹

2021

Физика Твердого Тела

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The review discusses the details of various materials mechanical behavior in submicro- and nanoscale. Significant advances in this scope result from the development of wide family of load based precise nanotesting techniques called nanoindentation. But nowadays, nanomechanical properties are studied not only by nanoindentation techniques in narrow sense, i.e. local loading of macro, micro and nanoscale objects. Nanomechanical load testing is discussed here within a wider scope employing precise deformation measurement with nanometer scale resolution caused by various types of low load application to the object under study including uniaxial compression or extension, shearing, bending or twisting, optionally accompanied by in situ monitoring sample microstructure using scanning and transmission electron microscopy and Laue microdiffraction technique. The main courses of experimental techniques development in recent ten years along with the results obtained using them in single, poly and nano crystalline materials, composites, films and coatings, amorphous solids and such biomaterials as tissues, living cells and macromolecules are described. Special attention is paid to deformation size effects and atomic mechanisms in nanoscale. This review is a natural continuation and development of the review published at Fiz.Tverd.Tela vol.50, issue 12, 2008 of the same author that discusses details of nanomechanical properties of solids. Current review includes wider range of nanomechanical testing concepts and recent achievements in the scope. The work was supported by RFBR grant for project #19-12-50235.

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“…The analysis of defects and cracks in metal plates, as well as their causes, has been widely studied. In some cases, hydrogen diffusion can produce embrittlement and can be associated with stress-corrosion cracking [6][7][8]. In other cases, hydrogen bubbles can appear; they are cavities below the surface of the material due to excessive internal pressure and can be the origin of hydrogen-induced cracking [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Extreme Equilibrium Conditions of an Internal Cavity Located Inside a Flat Metal Plate Subjected to an Internal Pressure p

et al. 2020

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The influence of surface bulges and cavities within metals is an important metallurgical-mechanical problem that has not been fully solved and motivates multiple discussions. This is not only related to the generation of interfaces, but also to the distribution of alloying components and elements. In this study, Laplace’s equation was used to develop a set of equations to describe these kinds of defects in plates, which arise during the development of metallurgical processes, and this can be used for the prediction of pipeline failures subjected to internal pressure. In addition, the stability conditions of a cavity under an internal pressure are analyzed. The developed method allows to identify the stress state in the generation of the cavity and its propagation. In addition to this, finite element analyses were carried out in order to show first the stress distribution around a cavity subjected to a series of theoretical operation conditions and second to show the crack growth on the tip of the cavity.

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Hydrogen embrittlement revealed via novel in situ fracture experiments using notched micro-cantilever specimens

Cited by 98 publications

References 47 publications

Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials

Discrete dislocation plasticity HELPs understand hydrogen effects in bcc materials

Наноиндентирование И Механические Свойства Материалов В Субмикро- И Наношкале. Недавние Результаты И Достижения (О Б З О Р)

Analysis of the Extreme Equilibrium Conditions of an Internal Cavity Located Inside a Flat Metal Plate Subjected to an Internal Pressure p

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