Effect of Microstructure on Hydrogen Diffusion in Weld and API X52 Pipeline Steel Base Metals under Cathodic Protection

Souza, Rhuan Costa; Pereira, L.; Starling, L. M.; Pereira, Júlia Nascimento; Simões, Thiago A.; Gomes, José Orlando; Bueno, Alysson Helton Santos

doi:10.1155/2017/4927210

Cited by 9 publications

(2 citation statements)

References 39 publications

(79 reference statements)

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“…A repedések keletkezése és terjedése is a hidrogéntartalom ezen pontján történik. Ezért fontos felmérni, hogy a hidrogén diffúziója eltérő módon megy-e végbe a különböző szövetszerkezetekben, mint például az alapfémben és a varratban [14].…”

Section: A Hidrogén Diffúziója a Hegesztett Kötésbenunclassified

A diffúziós hidrogéntartalom hegesztett kötésekre gyakorolt hatása

Kovács

Dakhel

Lukács

2021

MDT

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A hidrogén okozta repedés, illetve a hidegrepedés egy gyakran előforduló károsodási mechanizmus, ami a fémek és az ötvözetek többségére hatással van. A hidegrepedést számos külső és belső paraméter befolyásolja, így a repedéskialakuláshoz hozzájáruló tényezők meghatározása gyakran nehézségbe ütközik. Jelen áttekintő cikkben, hazai és nemzetközi szakirodalmi források alapján, a hidrogén előfordulását, oldhatóságát, diffúzióját és mennyiségi maghatározásának a lehetőségeit vizsgáljuk, valamint a hidegrepedés mechanizmusát és kialakulásának lehetséges megakadályozási módjait foglaljuk össze.

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Section: A Hidrogén Diffúziója a Hegesztett Kötésbenunclassified

A diffúziós hidrogéntartalom hegesztett kötésekre gyakorolt hatása

Kovács

Dakhel

Lukács

2021

MDT

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“…However, a problem must be considered, namely that for high-strength steels with similar chemical compositions, deviations in the diffusion coefficients of up to three orders of magnitude are found for ambient temperature (Ref 13). Chemically similar base materials (BM), such as low-alloy pipeline steels, are in the range of 10 À4 mm 2 /s (Ref 14,15) and thus up to one order of magnitude higher. Thus, mere base material considerations are not suitable for estimating a MWT or even the dwell time for a HRHT.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Hydrogen Diffusion in Offshore Steel S420G2+M Multi-layer Submerged Arc Welded Joint

Rhode

Nietzke

Mente

et al. 2022

J. of Materi Eng and Perform

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As onshore installation capacity is limited, the increase in the number of offshore wind turbines (OWT) is a major goal. In that connection, the OWTs continuously increase in size and weight and demand adequate foundations concepts like monopiles or tripods. These components are typically manufactured from welded mild steel plates with thickness up to 200 mm. The predominant welding technique is submerged arc welding (SAW). In accordance with the standards, the occurrence of hydrogen-assisted cracking is anticipated by either a minimum waiting time (MWT, before non-destructive testing of the welded joint is allowed) at ambient or a hydrogen removal heat treatment (HRHT) at elevated temperatures. The effectiveness of both can be estimated by calculation of the diffusion time, i.e., diffusion coefficients. In this study, these coefficients are obtained for the first time for a thick-walled S420G2+M offshore steel grade and its multi-layer SAW joint. The electrochemical permeation technique at ambient temperature is used for the determination of diffusion coefficients for both the base material and the weld metal. The coefficients are within a range of 10−5 to 10−4 mm2/s (whereas the weld metal had the lowest) and are used for an analytical and numerical calculation of the hydrogen diffusion and the related MWT. The results showed that long MWT can occur, which would be necessary to significantly decrease the hydrogen concentration. Weld metal diffusion coefficients at elevated temperatures were calculated from hydrogen desorption experiments by carrier gas hot extraction. They are within a range of 10−3 mm2/s and used for the characterization of a HRHT dwell-time. The analytical calculation shows the same tendency of long necessary times also at elevated temperatures. That means the necessary time is strongly influenced by the considered plate thickness and the estimation of any MWT/HRHT via diffusion coefficients should be critically discussed.

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