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

Balitskii, Alexander; Dmytryk, V.V.; Іvas’kevych, L. М.; Balitskii, O.A.; Glushko, A.V.; Medovar, Lev B.; Abramek, K. F.; Stovpchenko, Ganna P.; Eliasz, Jacek; Królikowski, Marcin

doi:10.3390/en15166006

Cited by 8 publications

(4 citation statements)

References 114 publications

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“…In accordance with [1][2][3][4][5], under certain conditions, e.g., high temperatures and pressures, electrolytic reactions, and the plastic deformation of metal, a significant amount of hydrogen can dissolve in metallic materials, subjecting them to "hydrogenation", accompanied by a change in structure and mechanical properties of the metal [6], which in some cases may be the cause of the destruction of the metal structure [7,8]. Thus, according to the authors of [9,10], hydrogenation of the pipe material in an area with destroyed insulation, which occurs due to the presence of atomic hydrogen as a product of ground water electrolysis, on the metal surface, is exactly the cause of breakage of underground main gas pipelines due to stress corrosion damage.…”

Section: Introductionmentioning

confidence: 89%

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

Bolobov

Latipov

Zhukov³

et al. 2023

Energies

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The paper deals with a non-destructive method of detecting hydrogenated sections of pipelines, which is based on variations of the level of mechanical stresses generated in the surface layers of the steel pipe material during its hydrogenation. The use of a magnetoanisotropic method based on the phenomenon of metal magnetoelastic anisotropy development, which consists in the variation of the magnetic properties of ferromagnetic materials in direction and magnitude under the influence of mechanical stresses, is proposed as a way to register that variation. Based on the results of tensile testing of carbon steel plates with measurement of the difference in principal mechanical stresses (DPMS) occurring in metal, as well as experiments on electrolytic hydrogenation of specimens with measurement of the DPMS signal, it was confirmed that when steel structures are saturated with hydrogen, tensile stresses are generated in the surface layers, the magnitude of which increases as the concentration of hydrogen increases in the metal. In this case, it is assumed that the indicated dependence between the hydrogen concentration in the metal and the stresses arising as a result of hydrogenation is linear. For the example of lamellar specimens made of pipe low-carbon steel, the possibility of using the magnetoanisotropic method for registering sections of underground pipelines with a high content of hydrogen is substantiated, which can become the basis for a method of diagnosing sections of pipelines with broken insulation for the possibility of their further operation. The scientific novelty of this article is the establishment of a relationship between the hydrogen content in the metal, the stresses that arise in this case, and the change in the magnetic properties of ferromagnetic materials, characterized by the magnitude of the DPMS signal. This study contributes to the understanding of the process of hydrogenation of metals, and may be useful in detecting and preventing damage to gas and oil pipelines caused by hydrogen embrittlement as a cause of stress corrosion.

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Section: Introductionmentioning

confidence: 89%

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

Bolobov

Latipov

Zhukov³

et al. 2023

Energies

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“…When conducting structural and phase studies, we took into account the previously obtained results aimed at obtaining relatively small austenite grains in the heat-affected zone [3,5]. However, for the first time, by modeling [1,2,4], they solved the problem of obtaining such grains, which significantly increased the properties of welded joints [2,6]. For example, the area of incomplete recrystallization of HAZ (see Fig.…”

Section: Fig 4 the Structure Of The Weld Metal ×400mentioning

confidence: 99%

Improvement of Welding Technology of High Power Turbine Rotor

Dmitrik,

Glushko,

Kasianenko

et al. 2024

Problems of Atomic Science and Technology

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In order to solve the problem of increasing the reliability and increasing the service life of welded joints of rotors of high-power turbines of nuclear and thermal power plants, the technology of their manufacture was improved. The improved technology provided obtaining welded joints of rotors with improved characteristics of their original structure and higher mechanical and physical properties. The given properties were determined by comparing with similar properties that are characteristic of the welded connection of the rotor made according to standard technology. The improvement of the technology involved the modeling of welding heating of manufactured joints, which made it possible to optimize the parameters of the mode of automatic welding of the rotor made of 25Х2НМФА steel. For the first time, the thermal problem was solved as a conjugate one under the conditions of the Navier-Stokes and Fourier laws, which provided the results necessary for increasing the reliability of the rotors, as well as increasing their resource.

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“…Additionally, they are also cost-effective. However, during the welding process, the considerable local heat input and subsequent rapid cooling result in residual stress formation and dimensional distortions [9][10][11][12][13]. Owing to the compression of the fusion zone in the cooling period, the residual stresses appear in the neighborhood of the weld region in the form of normally tensile stresses [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Predictions of Cryogenic Leakages in Welded Steel Plates

et al. 2023

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This study presented experimental and numerical research to investigate the effect of cryogenic leakage on a plate structure of AH36-grade steel containing welded joints. To simulate the cryogenic leakage conditions, the welded plate was exposed to a temperature of −196 °C by supplying liquid nitrogen (LN2) to the center of the steel plate. The time-dependent temperature history and strain variation were measured by using thermocouples and strain gauges attached to the plate surface. Additionally, the residual stress of the middle surface section before and after the cryogenic leakage process was measured by X-ray diffraction analysis (XRD). A three-dimensional finite element model was created with the use of a commercial finite element analysis (FEA) program to simulate the flux-cored arc welding process and cryogenic leakage process. The steel surface temperature dropped sharply and reached approximately −196 °C at 160 s after LN2 supplement. After the first 650 s of the LN2 leakage experiment, the outside of the trough reached approximately −75 °C and −25 °C, depending on the location of the thermal couples. Although there was a relative difference in the results, the experiment and numerical simulation results for temperature and stress distribution showed good agreement. The results could be utilized in the ship design stage adopting welded structures as a basic database.

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

Cited by 8 publications

References 114 publications

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

Using the Magnetic Anisotropy Method to Determine Hydrogenated Sections of a Steel Pipeline

Improvement of Welding Technology of High Power Turbine Rotor

Experimental and Numerical Predictions of Cryogenic Leakages in Welded Steel Plates

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