Study on Hydrogen Diffusion Behavior during Welding of Heavy Plate

Yang, Jianguo; Liu, Guohao; Zheng, Wenjian

doi:10.3390/ma13173887

Cited by 5 publications

(3 citation statements)

References 41 publications

(46 reference statements)

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“…Due to the large plate thickness, long diffusion times have to be anticipated independently of the used diffusion coefficients. Nonetheless, the obtained differences in the diffusion coefficients (see 34). From the viewpoint of any HAC concern, it has to anticipated that our simulation shows the normalized hydrogen concentration, i.e., it can be multiplied with any value as initial concentration.…”

Section: Numerical Analysis Of Hydrogen Diffusion In the Weldedmentioning

confidence: 88%

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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Section: Numerical Analysis Of Hydrogen Diffusion In the Weldedmentioning

confidence: 88%

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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“…A hegesztés következtében fellépő hidegrepedést általában a hegesztett kötésben három együttesen fellépő tényező okozza: a kemény szövetszerkezet (mint például a bénit vagy martenzit), a diffúzióképes hidrogén jelenléte és a magas (maradó) feszültségállapot (2. ábra). A hegesztett kötés kialakítása közben, különösképpen, ha nagyszilárdságú acélról van szó, az előbb említett három tényező az idő változásával összetett módon változik és egymást is befolyásolja [6,11,[16][17][18].…”

Section: Hidegrepedés a Hegesztett Kötésekbenunclassified

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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“…The results showed that the concentration of hydrogen ions at the crack tip is higher due to the effect of residual stress in the material, and the residual tensile stress could enhance hydrogen diffusion and concentration. Yang et al [28] investigated the phenomenon of hydrogen diffusion induced by the changes of residual stress from solid-state phase transition in thick rigid plate welding. Sato et al [29] analyzed the correlation between cold cracking, surface residual stress and hydrogen aggregation within the high-strength steel weld bead.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Surface Integrity on Hydrogen Permeation Resistance of Hydrogen Production Reactor Materials

Leng,

Zhang,

Wang

et al. 2023

Applied Sciences

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Hydrogen permeation reduces a material’s properties and increases the risk of brittle fracture, which causes a potential safety hazard. A workpiece’s hydrogen permeation resistance could be improved by improving its surface integrity through surface processing. This paper studies low-alloy steel’s surface integrity and its hydrogen permeation resistance in a hydrogen production reactor, using the electrochemical cathodic hydrogen-charging method to carry out electrochemical hydrogen-charging experiments. After the specimens were pretreated using different surface-grinding methods and shot peening pressure strengthening, they were hydrogen-charged on a self-designed and built electrolytic hydrogen charging platform. Before and after hydrogen charging, the specimens’ section hardness and tensile strength were tested, and the fracture morphology of the specimens was observed. The influence laws of surface roughness and surface residual compressive stress on the distribution of material hardness along the depth, the variation in material hardness, the fracture morphology, and the decline in the tensile properties of the low-alloy steel specimens after 5 h of hydrogen charging were analyzed. The reasons for the influence of surface integrity indexes on the hydrogen permeation resistance of the specimens were also analyzed. Based on the experimental results, a series of mechanical processing parameters were proposed to improve the material’s permeation resistance, which provides a theoretical and practical basis for the processing of materials with high surface integrity and hydrogen permeation resistance. Through the experiments, it was found that the hydrogen permeation resistance of the Ra 0.17 μm surface roughness specimen was the best of all specimens with different surface roughness values, and its hydrogen embrittlement sensitivity index was 20.96%. The specimen had the best hydrogen permeation resistance under 336 MPa surface residual compress stress, and its hydrogen embrittlement sensitivity index was 16.45%.

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Study on Hydrogen Diffusion Behavior during Welding of Heavy Plate

Cited by 5 publications

References 41 publications

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

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

A diffúziós hidrogéntartalom hegesztett kötésekre gyakorolt hatása

Study on the Influence of Surface Integrity on Hydrogen Permeation Resistance of Hydrogen Production Reactor Materials

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