Measurement of hydrogen and embrittlement of high strength steels

In this work hydrogen diffusion towards the fracture process zone is examined accounting for local hardening due to geometrically necessary dislocations (GNDs) by means of strain gradient plasticity (SGP). Finite element computations are performed within the finite deformation theory to characterize the gradient-enhanced stress elevation and subsequent diffusion of hydrogen towards the crack tip. Results reveal that GNDs, absent in conventional plasticity predictions, play a fundamental role on hydrogen transport ahead of a crack. SGP estimations provide a good agreement with experimental measurements of crack tip deformation and high levels of lattice hydrogen concentration are predicted within microns to the crack tip. The important implications of the results in the understanding of hydrogen embrittlement mechanisms are thoroughly discussed.

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“…When exposed to hydrogen, high-strength alloys suffer from a loss of ductility and toughness leading to premature failure (Sanchez et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

Martínez‐Pañeda

Busto

Niordson

et al. 2016

International Journal of Hydrogen Energy

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“…Однако повышения концентр ации внутри образца не наблюдается, что требует дополнительного исследования, тем более, что аналогичные результаты были уже получены ранее. В работах [36,37] отмечено, что нет определенной связи между концентрацией водорода после насыщения и механическими свойствами. В работе [38] отмечено, что недельная выдержка стальных обр азцов на воздухе после электролитического насыщения водородом приводит к восстановлению пластичности металла.…”

Section: обсуждение результатовunclassified

Boundary Layer Influence on the Distribution of Hydrogen Concentrations During Hydrogen-Induced Cracking Test of Steels

Alekseeva¹,

Belyaev²,

Zegzhda³

et al. 2018

DREAM

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“…Previous paper was focused into the mechanical behavior of corroded rebars (Sanchez et al, 2017a) in order to estimate their service life. A final tolerance diagram was obtained where it is taken into account the effect of corrosion, stress corrosion cracking, and hydrogen embrittlement effects (Sanchez et al, 2008b(Sanchez et al, , 2010Sánchez et al, 2016a;Sanchez et al, 2016bSanchez et al, , 2017bCastedo et al, 2011Castedo et al, , 2012Elices et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Experimental and Statistical Analysis of the Corrosion in Tendons in Contact With Water

et al. 2019

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It is commonly mentioned that corrosion of steel in presstressed concrete can induce brittle failure. It is also understood that in order to estimate the presstressed structures service life is necessary to study the pitting factor that compares the maximum corrosion pit depth with the section loss by homogeneous corrosion. Results are presented on corrosion tests to measure the corrosion depth in tendons in contact with water. In present paper, a statistical analysis has been carried out in order to obtain the pitting factor for different cross sections submerged in water. The results indicate that the pitting factor value varies between 1.20 and 1.85 depending on the confidence interval considered, which can significantly reduce the service life of the presstressed tendons as long as the exposure conditions are those set out in this study.

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Measurement of hydrogen and embrittlement of high strength steels

Cited by 51 publications

References 37 publications

Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

Strain gradient plasticity modeling of hydrogen diffusion to the crack tip

Boundary Layer Influence on the Distribution of Hydrogen Concentrations During Hydrogen-Induced Cracking Test of Steels

Experimental and Statistical Analysis of the Corrosion in Tendons in Contact With Water

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