Effects of hydrogen on the fracture toughness of X80 steel base metal and girth weld under strong cathodic current with in-situ hydrogen charging

Xing, Yanfei; Yang, Zhou; Yao, Xingcheng; Wang, Xiuyun; Lu, Minxu; Zhang, Lei; Li, Qiao

doi:10.1016/j.engfailanal.2022.106143

Cited by 15 publications

(5 citation statements)

References 49 publications

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“…However, this is not the only factor that exerts control over toughness results. The microstructure, the hardness and the amount of hydrogen introduced into the material are the most important points that can cause strong variation in the results of hydrogen embrittlement 22,[61][62][63][64] . Hydrogen tends to accumulate in the regions of greater strain 11,12,65 and the dislocation mobility can be enhanced by the higher hydrogen concentration at the tip of the notch.…”

Section: Fracture Mechanicsmentioning

confidence: 99%

Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel

et al. 2023

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Hydrogen embrittlement (HE) in API 5L X70 steel was investigated by testing notched and unnotched uniaxial tensile specimens and single-edge tension specimen, SE(T). Apparent hydrogen diffusivity (D app = 1.4 x 10 -10 m 2 /s) and solubility (S app = 4.9 mol H/m 3 ) were determined by electrochemical hydrogen permeation tests. Through mathematical fitting, it was possible to separate the strong traps present at the beginning of the first permeation curve (φ = 0.43 mol H/m 3 ). Uniaxial tensile tests showed a loss of ductility of up to 33% in the hydrogenated condition. Fracture mechanics tests exhibited a toughness decrease of 14% after exposure to hydrogen. The high resistance to HE was presented suggesting that these microalloyed steels can solubilize hydrogen in the matrix with low segregation, reducing the impact on embrittlement. A mix of ductile and quasi-cleavage fracture was observed in the hydrogenated samples with an increased stress triaxiality.

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Section: Fracture Mechanicsmentioning

confidence: 99%

Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel

et al. 2023

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“…The operation of many structures-particularly, steam and hydrogen turbine rotors, cooling infrastructures of powerful semiconductor devices and industrial singlecrystal growth applications [3][4][5][6][7][8][9][25][26][27][28][29][30][31][32][33][34]45,[55][56][57][58][59][79][80][81][82][83][84][85][86][87][88][89][90][91]110]-is accompanied by their cyclic loads, which often exceed the yield strength of the material [52,[54][55][56], based on understanding the hydrogen embrittlement of materials from the atomistic level to the continuum [100][101][102][103][123][124][125]…”

Section: Hydrogen Influence On the Welded Joint Durability Under Cycl...mentioning

confidence: 99%

Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints

et al. 2022

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This article is devoted to the following issues: calculating the values of temperatures obtained by simulating welding heating and the subsequent implementation of the welding process at the given mode parameters made it possible to obtain a welded joint of the rotor with an improved initial structure and increased mechanical properties, hydrogen resistance and durability by up to 10–15%; simulating welding heating in the areas of fusion, the overheating and normalization of the HAZ and the formation of austenite grains; specified welding heating creates the conditions for the formation of new products of austenite decomposition in the form of sorbitol in the area of the incomplete recrystallization of the HAZ. In air and gaseous hydrogen, the destruction of the combined joints took place on the weld metal, as well as on the fusion areas, the overheating and the incomplete recrystallization of the HAZ of 20H3NMFA steel as the base metal. Structural materials have a relatively low strength and high fracture toughness in air. This is manifested in a significant reduction in the elongation (δ), the area (ψ) and critical stress intensity factor (KIc) of welded joints and the endurance limit of cylindrical smooth rotor steel specimens, which were cut from transverse templates. Welded joints in the whole range of load amplitudes are sensitive to the action of hydrogen.

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“…After 40 h of hydrogen charging, the toughness of the titanium alloy suffered a significant loss, and the elongation decreased from 20.2% to 1.0% [18]. As the electrochemical hydrogen charging current density increases, the HE sensitivity of pipeline steel and girth weld increases [19]. Therefore, the correlation of electrochemical hydrogen charging current density and hydrogen charging time with blistering and mechanical properties' loss of Q690 steel was investigated by applying hydrogen charging current density.…”

Section: Introductionmentioning

confidence: 99%

“…After 40 h of hydrogen charging, the toughness of the titanium alloy suffered a significant loss, and the elongation decreased from 20.2% to 1.0% [18]. As the hydrogen charging current density increases, the HE sensitivity of pipeline steel and girth weld increases [19].…”

Section: Introductionmentioning

confidence: 99%

Effect of Electrochemical Hydrogen Charging on Blistering and Mechanical Properties Behavior of Q690 Steel

Tian

Wang

et al. 2023

Crystals

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The purpose of this work is to study the effect of charging conditions on hydrogen damage. The effects of electrochemical hydrogen charging current density and time on hydrogen-induced blistering (HIB), cracking behavior, and mechanical properties of Q690 steel are studied by electrochemical hydrogen charging, microstructure observation, and slow strain rate tensile (SSRT) tests. The results show that HIB and internal cracks occur when the Q690 steel is charged at different current densities. The charging conditions have a significant effect on the HIB characteristics of the material and the morphology, number, size, and location of internal cracks. The geometrical parameters of blisters on the surface of Q690 steel are quantitatively evaluated, and deeper cracks are found at higher hydrogen concentrations. At high hydrogen charging current density (50 mA/cm2), due to the accumulation of a large number of hydrogen atoms and the precipitation of hydrogen, the active sites on Q690 steel surface increase dramatically, leading to the initiation of a large number of blisters. At this time, high current density is responsible for the initiation of blisters. The relationship between hydrogen charging current density and mechanical properties of Q690 steel is studied, and the change in the fracture morphology is observed. The Q690 steel was damaged and failed due to an internal crack caused by excessive hydrogen pressure. On the other hand, electrochemical hydrogen charging leads to the degradation of mechanical properties and the transition from ductile fracture to brittle fracture.

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Effects of hydrogen on the fracture toughness of X80 steel base metal and girth weld under strong cathodic current with in-situ hydrogen charging

Cited by 15 publications

References 49 publications

Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel

Effects of Hydrogen in Stress Triaxiality of API 5L X70 Steel

Improvement of the Mechanical Characteristics, Hydrogen Crack Resistance and Durability of Turbine Rotor Steels Welded Joints

Effect of Electrochemical Hydrogen Charging on Blistering and Mechanical Properties Behavior of Q690 Steel

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