The influence of hydrogen desorption on micromechanical properties and tribological behavior of iron and carbon steels

Pokhmurskii, V. I.; Khoma, М. S.; Vynar, V. А.; Vasyliv, Kh. B.; Rats’ka, N. B.; Voronyak, Taras I.; Stasyshyn, Ihor V.

doi:10.1016/j.prostr.2018.12.142

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…It should be noted that the results of research [117,118] indicate that such nanostructures can serve as a barrier for the penetration of hydrogen into steel. Mechanisms of initiation and propagation of cracks in metals under high-temperature loads were developed by researchers [119,120], and the influence of hydrogen on the properties of metals in various environments was discussed in detail in papers [121][122][123].…”

Section: Study Of the Drilling Drawwork Brake Wearmentioning

confidence: 99%

“…We investigated the composition of the polymer friction material FK-24A of brake friction pads on the friction surface in a worn state without cracks (Figure 8) and in a worn state with cracks (Figure 9). hydrogen on the properties of metals in various environments was discussed in detail in papers [121][122][123].…”

Section: Study Of the Drilling Drawwork Brake Wearmentioning

confidence: 99%

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Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Mandziy,

Ivasenko,

Berehulyak

et al. 2024

Lubricants

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The improvement of drilling rig systems to ensure a reduction in unproductive time spent on lowering and lifting operations for replacing drilling tools and restoring the performance of drilling equipment units is an important task. At the same time, considerable attention is paid to the reliable and efficient operation of the braking systems of drilling rig winches. In the process of operation, the polymer pads periodically come into contact with the outer cylindrical surface of the metal pulley during braking, work in extreme conditions and wear out intensively, so they need periodic replacement. Tests were carried out on a modernized stand and in industrial conditions for the brakes of drilling winches. A methodology for evaluating the degradation of the brake pad friction surface during its operation is proposed. The assessment of the degradation degree is carried out based on the image of the brake pad surface using image processing techniques. Geometric transformations of the input image were performed to avoid perspective distortions caused by the concave shape of the brake pads and the spatial angle at which the image is acquired to avoid glares. The crack detection step was implemented based on the scale-space theory, followed by contour detection and skeletonization. The ratios of the area and perimeter of segmented and skeletonized cracks to the total area were chosen as integral characteristics of the degradation degree. With the help of scanning electron microscopy, the character of the destruction of the friction surface and the degradation of the polymer material was investigated. Experimental studies were performed, and the application of the proposed method is illustrated.

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Section: Study Of the Drilling Drawwork Brake Wearmentioning

confidence: 99%

Section: Study Of the Drilling Drawwork Brake Wearmentioning

confidence: 99%

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Mandziy,

Ivasenko,

Berehulyak

et al. 2024

Lubricants

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“…Atomic hydrogen formed in these local contact zones acts as a catalyst of the tribochemical reactions [17]. There are several features that describe the interaction between hydrogen and metals (in particular, steels) caused by the existence of diffusive and residual hydrogen [18][19][20]. In the atomic form, hydrogen can be "diffusion active" and move freely in the crystal lattice of the metal.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrogen on the Wear Resistance of Steels upon Contact with Plasma Electrolytic Oxidation Layers Synthesized on Aluminum Alloys

Hutsaylyuk

Студент

Dovhunyk

et al. 2019

Metals

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The different nature of the effect of hydrogen on the tribological behavior of two carbon steels (st. 45 and st. U8) upon their contact with super solid plasma electrolytic oxidation (PEO) layers synthesized on two light alloys (AMg-6 and D16T alloys as the analogists of the A 95556 UNS USA and AA2024 ANSI USA alloys correspondently) was investigated in the medium of mineral oil of the I-20 type. To compare the effect of hydrogenation on the tribological properties of the analyzed contact pairs, similar tests were also performed on the same mineral oil with clear water or an aqueous solution of glycerine added to its content. A spinel-type film (hercynite) was formed upon friction of two contacting surfaces—the iron-carbon steels and PEO layers synthesized on the AMg-6 alloy. This film was a reliable protection against wear of the surface subjected to the effect of hydrogen. When steels came into contact with the PEO layers synthesized on the D16T alloy, surface protection against wear was ensured by another mechanism. The phenomenon of selective metal transfer in the friction zone (from one to another friction surfaces) was revealed.

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Increasing fretting resistance of flexible element pack for rotary machine flexible coupling Part 1. Analysis of the reasons affecting fretting resistance of flexible elements for expansion couplings

Hlushkova

Martsynkovskyy

Dumanchuk

et al. 2021

J. Phys.: Conf. Ser.

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It has been made an analysis of the rotor machine flexible coupling (FC) failure reasons. As a result, it has been found out that the flexible coupling trouble-free operation period is limited by the pack of the flexible elements (FE) durability which depends on the fretting resistance of the individual flexible elements (plates) of the pack. The investigations with the use of an electron microscope have proved that there are at least three stages of the FE destruction: the formation of microfractures in the form of caverns at separate points of the FE destruction zone, which microfractures preserve microparticles of the destroyed metal in a confined space; weakening of the compression force affecting the plates and the wear product release from the fracture site; occurrence of abrasive wear resulting in the complete destruction of the FE. There has been substantiated the need in performing the FE stress-strain state analysis and determining the geometric and strain parameters of the strain zone, which can serve as a reserve for increasing the FE fretting resistance.

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The influence of hydrogen desorption on micromechanical properties and tribological behavior of iron and carbon steels

Cited by 3 publications

References 9 publications

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Evaluation of the Degree of Degradation of Brake Pad Friction Surfaces Using Image Processing

Effect of Hydrogen on the Wear Resistance of Steels upon Contact with Plasma Electrolytic Oxidation Layers Synthesized on Aluminum Alloys

Increasing fretting resistance of flexible element pack for rotary machine flexible coupling Part 1. Analysis of the reasons affecting fretting resistance of flexible elements for expansion couplings

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