Analysis of acoustic and physical-mechanical parameters of Cr-Mo-Va steel in the vicinity of the crack

Смирнов, А. Н.; Logov, A. B.; Ababkov, Nikolay

doi:10.1063/1.4937822

Cited by 3 publications

(4 citation statements)

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“…In this work, the research was also carried out in order to choose a nondestructive control method for sorting bearings by metal quality in order to identify dangerous defects in the microstructure of finished bearings. For this, sound velocity method based on autocirculation of ultrasound pulses was chosen [15]. The tests were carried out on the Astron measuring and computing device (see Table 3).…”

Section: Discussion Of Study Resultsmentioning

confidence: 99%

Steel quality of rolling contact bearings produced by different manufacturers, used for mining equipment instrumentation

et al. 2021

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Severe operating conditions of mining equipment have a negative impact on the operating life of the rolling contact bearings used in such equipment. The main reasons for the premature failure of rolling contact bearings include, first of all, poor quality of the bearing steel as delivered and the defects of their subsequent heat treatment. The abovementioned reasons result in splitting of bearings, metal shelling and appearance of potholes on their tracks, as well as intense abrasive wear. Nevertheless, despite the importance of this issue, the quality of bearing steel, either as delivered or in finished bearings, is usually not under control.To solve this problem, the quality of bearing steel was studied, exemplified by the bearings of the Russian, Swedish (SKF) and Japanese (NSK) manufacturers, i.e., main suppliers of rolling contact bearings for mining equipment in Russia. The problem of bearing steel quality control was solved by developing a quality control methodology that took into account the state of the metal after metallurgical treatment and at the stage of bearing production. Based on this methodology, the main types of bearing steel defects affecting the mechanism of bearing failure are identified.It is found that the bearing steel quality of domestic manufacturers is highly competitive with foreign counterparts. A method of nondestructive control is also proposed for detecting possible microstructure defects in bearings, either as delivered or while in operation.

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Section: Discussion Of Study Resultsmentioning

confidence: 99%

Steel quality of rolling contact bearings produced by different manufacturers, used for mining equipment instrumentation

et al. 2021

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“…Thus, resource assessment is a timeconsuming process, not always ensuring the required accuracy of the results obtained due to the summation of various kinds of errors (calculations, equipment, human factor). A number of approaches to assessing the critical state of long-term equipment use information on the characteristics of the metal after failure [4][5][6]. While information about the patterns of localization of plastic flow in a loaded material [7], which occurs before the formation of a neck and accurately indicates the place of future destruction, can serve as a more perfect critical indicator for stopping equipment operation.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Initial State of Samples From Steel 20 on the Structural-Phase Condition to the Stable Zone Localization of Macrodeformation

et al. 2019

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One of the most important tasks of technical diagnostics and examination of industrial safety is the problem of assessing the residual life of long-running technical devices of hazardous production facilities. The paper presents the results of the study of the structural-phase state in a stable zone of localization of macrostrains, depending on the initial state of samples from steel 20. The samples were investigated without exploitation, after operation without destruction and with destruction. The samples were stretched at the same speed until a stable zone of strain localization appeared, after which the loading was stopped. The connection is established between the processes of localization of macrostrains and the evolution of the substructural state for steel 20. It has been established that the mechanism of localization of macrodeformations is the achievement of critical values of a fragmented substructure, in other words, according to the theory of evolution of substructural transformations, a bifurcation point occurs when the % fragmented substructure prevails. The critical values of dislocation density are established, which lead to a change in the type of dislocation substructure for equipment made of steel 20.

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“…One of the methods for monitoring the state of the metal of welded joints, the base metal and detection of discontinuities is currently the spectral-acoustic method. Earlier, the authors of [11][12][13][14] established that this method of control is a sensitive method for estimating local fields of internal stresses and microstructure parameters (dislocation density, curvature-torsion of the crystal lattice, etc.). In addition, the acoustic characteristics of materials (propagation velocity of elastic waves, attenuation and dispersion, acoustic impedance) are related to the mechanical properties of materials [6,9].…”

Section: Introductionmentioning

confidence: 99%

“…This allows us to judge by its acoustic characteristics the material's mechanical properties. The authors of [11][12][13] proposed complex criteria for the degree of metal damage in relative units.…”

Section: Introductionmentioning

confidence: 99%

Metal Control of Operated and Damaged Situated Parts and Welded Wire Connections

Ababkov

Смирнов

Pimonov

et al. 2018

MSF

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Investigation of the metal of exploited and damaged bends of water and steam-removing pipes by the spectral-acoustic control method and by the method of electron microscopy was carried out in the work. A sample without damages, a specimen with a corrosion-fatigue crack and a sample with a technological sunset type defect were investigated. Graphic dependencies of acoustic characteristics on the time of operating time are constructed. The values of the acoustic characteristics corresponding to the defective state for the metal of the bends of the water and steam-removing pipes have been established.

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Analysis of acoustic and physical-mechanical parameters of Cr-Mo-Va steel in the vicinity of the crack

Cited by 3 publications

References 0 publications

Steel quality of rolling contact bearings produced by different manufacturers, used for mining equipment instrumentation

Steel quality of rolling contact bearings produced by different manufacturers, used for mining equipment instrumentation

Influence of the Initial State of Samples From Steel 20 on the Structural-Phase Condition to the Stable Zone Localization of Macrodeformation

Metal Control of Operated and Damaged Situated Parts and Welded Wire Connections

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