Methods for the Evaluation of Fracture and Strength of Pipeline Steels and Structures Under the Action of Working Media. Part 2. Influence of Hydrogen-Containing Media

Syrotyuk, А. М.; Dmytrakh, І. М.

doi:10.1007/s11003-015-9745-8

Cited by 21 publications

(5 citation statements)

References 10 publications

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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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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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“…To describe the accumulation of defects in a local volume according to the energy approach, we introduce a measure of damage ω(t) that characterizes the ratio of the energy of elastoplastic deformation of a local volume to its critical value in hydrogen W C [4,5,[10][11][12][13][14][15]:…”

Section: Energy Approach To the Evaluation Of The Residual Service Life Of Structural Elementsmentioning

confidence: 99%

“…In the course of operation of steam generators of nuclear power plants (NPP) with water-moderated watercooled reactors (WWR), we observe events of fracture caused by the corrosion cracking of heat-exchange pipes made of austenitic stainless steel [12]. Stainless chromium-nickel steels of the austenitic class (in particular, 08Kh18N10T) are widely used for the production of various critical elements of the equipment of thermal and nuclear power plants.…”

Section: Determination Of the Period Of Safe Operation Of Heat-exchange Pipes Of Steam Generatorsmentioning

confidence: 99%

Computer Modeling of the Influence of Hydrogenation on the Durability of Pipe Elements

2021

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We construct a mathematical model for the evaluation of the influence of hydrogen saturation and stress corrosion cracking on the durability of structural elements. By using the developed computer programs, we reproduce the processes of hydrogenation and deformation of structural elements. We also determined the service life of straight sections of heat-exchange pipes of steam generators of nuclear power plants under operating conditions.

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“…Hydrogen embrittlement [1,2] is the most severe degradation mechanism in buried pipeline steel and is an issue involving the loading, environment, and physical property of the steel [3,4,5,6]. Temperature is a determining factor in hydrogen diffusivity and bulk hydrogen concentration c o and, thus, also determines the level of hydrogen embrittlement [7,8,9]. Hence, crack propagation in pipeline steel has a strong temperature dependence.…”

Section: Introductionmentioning

confidence: 99%

Quantification of Temperature Dependence of Hydrogen Embrittlement in Pipeline Steel

et al. 2019

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The effects of temperature on bulk hydrogen concentration and diffusion have been tested with the Devanathan–-Stachurski method. Thus, a model based on hydrogen potential, diffusivity, loading frequency, and hydrostatic stress distribution around crack tips was applied in order to quantify the temperature’s effect. The theoretical model was verified experimentally and confirmed a temperature threshold of 320 K to maximize the crack growth. The model suggests a nanoscale embrittlement mechanism, which is generated by hydrogen atom delivery to the crack tip under fatigue loading, and rationalized the ΔK dependence of traditional models. Hence, this work could be applied to optimize operations that will prolong the life of the pipeline.

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Methods for the Evaluation of Fracture and Strength of Pipeline Steels and Structures Under the Action of Working Media. Part 2. Influence of Hydrogen-Containing Media

Cited by 21 publications

References 10 publications

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

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

Computer Modeling of the Influence of Hydrogenation on the Durability of Pipe Elements

Quantification of Temperature Dependence of Hydrogen Embrittlement in Pipeline Steel

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