Hydrogen effect on fracture toughness of pipeline steel welds, with in situ hydrogen charging

Chatzidouros, E.V.; Papazoglou, V.J.; Tsiourva, Th.; Pantelis, Dimitrios

doi:10.1016/j.ijhydene.2011.06.140

Cited by 78 publications

(37 citation statements)

References 30 publications

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“…The most important factors that control the susceptibility of a microstructure to hydrogen embrittlement are the hydrogen permeability and hydrogen trapping capacity of that microstructure. The grain coarsened heat affected zone (GCHAZ) adjacent to the weld zone is also a critical region for HE [6][7][8]. The susceptibility to hydrogen cracking can also be related to the steel composition and the processing history as these factors affect non-metallic inclusions (size, morphology and type).…”

Section: Introductionmentioning

confidence: 99%

Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels

Hejazi

Całka

Dunne

et al. 2016

Materials Science and Technology

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(2016). Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels. Materials Science and Technology, 32 (7), 675-683.Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels AbstractThe tensile properties of two X70 steels with high (1.14 wt-%) and medium (0.5 wt-%) Mn contents have been investigated by testing at 25°C of tubular specimens charged with an internal gas pressure of 10 MPa of hydrogen or argon. The hydrogen-charged samples were additionally tested at 50 and 100°C. Tensile testing showed that the equiaxed ferrite-pearlite microstructure of higher Mn steel was most sensitive to hydrogen embrittlement and that the banded ferrite-pearlite microstructure of the higher Mn strip was more susceptible to hydrogen embrittlement than the medium Mn strip. The more highly banded ferrite-pearlite microstructure in the higher Mn steel provided numerous sites for concentration of hydrogen to levels that promoted crack initiation and growth. Test temperatures up to 100°C reduced the yield and tensile strengths, increased the total elongation and decreased the extent of hydrogen embrittlement because of enhanced dislocation mobility and less effective hydrogen trapping. Tensile testing showed that the equiaxed ferrite-pearlite microstructure of higher Mn steel was most sensitive to hydrogen embrittlement (HE) and that the banded ferrite-pearlite microstructure of the higher Mn strip was more susceptible to HE than the medium Mn strip.The more highly banded ferrite-pearlite microstructure in the higher Mn steel provided numerous sites for concentration of hydrogen to levels that promoted crack initiation and growth.Test temperatures up to 100 o C reduced the yield and tensile strengths, increased the total elongation and decreased the extent of HE because of enhanced dislocation mobility and less effective hydrogen trapping.

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Section: Introductionmentioning

confidence: 99%

Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels

Hejazi

Całka

Dunne

et al. 2016

Materials Science and Technology

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“…For the simulation of hydrogen interaction with defects in an in-service structure, it is very important to charge the specimen while it is being deformed. The effects of in situ hydrogen charging of the samples during a monotonic loading in specially designed electrolytic cells used in a three-point bending test or in a tensile test were investigated by Chatzidouros et al [36] for pipeline steel welds and Biggiero et al [37] for a low-alloy AISI 9840 steel, respectively. Electrochemical cells were placed directly on the testing machines, and the samples were stressed until fracture without interrupting the hydrogenation.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gas Tungsten Arc Welding Parameters on Hydrogen-Assisted Cracking of Type 321 Stainless Steel

Rozenak

Unigovski

Shneck

2016

Metall Mater Trans A

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The susceptibility of AISI type 321 stainless steel welded by the gas tungsten arc welding (GTAW) process to hydrogen-assisted cracking (HAC) was studied in a tensile test combined with in situ cathodic charging. Specimen charging causes a decrease in ductility of both the as-received and welded specimens. The mechanical properties of welds depend on welding parameters. For example, the ultimate tensile strength and ductility increase with growing shielding gas (argon) rate. More severe decrease in the ductility was obtained after post-weld heat treatment (PWHT). In welded steels, in addition to discontinuous grain boundary carbides (M 23 C 6 ) and dense distribution of metal carbides MC ((Ti, Nb)C) precipitated in the matrix, the appearance of delta-ferrite phase was observed. The fracture of sensitized specimens was predominantly intergranular, whereas the as-welded specimens exhibited mainly transgranular regions. High-dislocation density regions and stacking faults were found in delta-ferrite formed after welding. Besides, thin stacking fault plates and epsilon-martensite were found in the austenitic matrix after the cathodic charging.

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“…Como o hidrogênio molecular (H 2 ) é um composto de grande diâmetro atômico, quando comparado ao hidrogênio atômico, e não se difunde no interior da estrutura cristalina, este se acumula em armadilhas existentes como lacunas, discordâncias, interfaces entre matriz e partículas de segunda fase, sulfetos, entre outros, resulta no aumento da pressão interna. O aumento da pressão interna em determinadas regiões da estrutura cristalina associada a tensões aplicadas favorece a nucleação e propagação de trincas (Dayal e Parvathavarthini, 2003;Chatzidouros et al, 2011).…”

Section: Teoria Da Pressão Internaunclassified

“…Figura 79 -Curva P vs LLD de aço hidrogenado e não hidrogenado a -70 o C (Fassina et al, 2012). Chatzidouros et al (2011) estudaram o efeito do carregamento de hidrogênio "in loco" na resistência à fratura de tubo com costura construído em aço API 5L X70. Foram realizados ensaios de fratura por flexão em três apoios simultâneos a hidrogenação, para determinação da Integral J, com o objetivo de reduzir a probabilidade do hidrogênio se difundir para a atmosfera, e proporcionar uma condição mais próxima da realidade pra o materila quando este estiver em serviço.…”

Section: Influência Na Resistência à Fraturaunclassified

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Comportamento De Aço Estrutural Api 5l X65 Após Exposição Ao Hidrogênio: Uma Abordagem Baseada Na Fratura Dúctil

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Hydrogen effect on fracture toughness of pipeline steel welds, with in situ hydrogen charging

Cited by 78 publications

References 30 publications

Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels

Effect of gaseous hydrogen charging on the tensile properties of standard and medium Mn X70 pipeline steels

Effect of Gas Tungsten Arc Welding Parameters on Hydrogen-Assisted Cracking of Type 321 Stainless Steel

Comportamento De Aço Estrutural Api 5l X65 Após Exposição Ao Hidrogênio: Uma Abordagem Baseada Na Fratura Dúctil

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