Experimentally verified prediction of friction coefficient and wear rate during running-in dry contact

Ghatrehsamani, Sahar; Akbarzadeh, Saleh; Khonsari, M. M.

doi:10.1016/j.triboint.2022.107508

Cited by 31 publications

(7 citation statements)

References 31 publications

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“…While the subsequent decrease in the coefficient of friction (COF) may be caused by the decrease in the SR due to the occurrence of relatively higher plastic deformation at the asperities under the highest applied load of 20N and also due to the decrease in the contact area because of the formed wear particles at the articulating surface. These trends are in line with the previously discussed friction behavior (Blau, 1981, 2005, 2008; Ghatrehsamani et al , 2022).…”

Section: Resultssupporting

confidence: 92%

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

Ceritbinmez,

Kanca,

Tuna

et al. 2023

AEAT

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Purpose FeNi36 (Invar-36) alloy is widely used in the fabrication of molding tools in aerospace industries but there remains a need to improve its wear and friction performance due to its relatively low hardness. The formation of a heat affected zone (HAZ) on the surface of Invar-36 cut by wire electric discharge machining (WEDM) is promising to enhance its tribological properties. This study aims to investigate the tribological performance of WEDM-treated Invar-36 via a ball-on-disk tribometer in dry-sliding conditions. Design/methodology/approach The untreated and WEDM-treated Invar-36 surfaces were reciprocated against an alumina ball at a sliding velocity of 40 mm/s, a stroke length of 10 mm and a sliding duration of 125 min under loads of 5, 10 and 20 N. The worn surfaces were characterized using a 2D profilometry and a scanning electron microscope equipped with energy-dispersive spectroscopy. Findings The results showed that the WEDM-treated surface had a superior friction coefficient and wear resistance in comparison to the untreated surface, due to the grown HAZ. There was found to be a 9.3%–11.4% decrease in the friction coefficient and a 47%–57% reduction in the wear volume after the WEDM treatment. Both the untreated and WEDM-treated Invar-36 surfaces found abrasion and plastic deformation as the dominant wear mechanisms. Originality/value Previous works have not focused on the tribological performance of the WEDM-treated Invar-36 extensively used for molding tools in aerospace industries. Our findings provide compelling evidence that the WEDM treatment improved the wear and friction performance of Invar-36 alloy because of the grown HAZ.

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Section: Resultssupporting

confidence: 92%

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

Ceritbinmez,

Kanca,

Tuna

et al. 2023

AEAT

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“…The research was based on the general technical requirements consistent with the procedure for testing material wear resistance at high temperatures [1]. To approximate as much as possible the physicochemical mechanics of friction and wear to real operating conditions, the appropriate changes have been made therewith.…”

Section: Methodsmentioning

confidence: 99%

Nanocomposite coatings for wear protection at high temperatures

Shchepetov,

Kharchenko,

Kharchenko

et al. 2024

Sist. dosl. energ.

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The investigation results of friction and wear of the developed detonation composite coatings FeAl2-Ti-Si-B under high-temperature friction conditions are presented. The choice of FeAl2-Ti-Si-B composition and its optimal content for spraying wear-resistant coatings loaded with friction under high-temperature conditions are justified. It is noted that the alloying elements at definite concentrations and technological parameters of spraying have a positive influence on the structure, properties, and quality assurance of multicomponent coatings. It is shown that the introduction of silicon and boron contributes the formation of hard-alloy high-temperature compounds with increased wear resistance. The maximum microhardness corresponds to the Cr-Si coatings with ~ 28 % titan content. In addition, the mechanical properties of the obtained material are improved by additional alloying of ~ 22 % silicon and bor. In turn, the coatings plating at a working gas flow rate in a ratio for acetylene ~ (20/25) l/min and oxygen ~ (22/27) l/min provides the chemical composition and spraying process parameters permanence as well as constant properties of coatings. The obtained results show that for the coatings of FeAl2-Ti-Si-B system at loading 5.0 MPa, sliding speed 1.5 m/s, and temperature up to 650 °C the stable performance of structural adaptability, which ensures the friction and wear parameters minimization, is demonstrated. The metallographic analysis and strip chart recording of specimens indicate that the friction surfaces are characterized by the absence of visible defects; the separate cold-welded regions are located in thin-film surface layers. The composition, structure, and tribological durability of coatings produced from the elements of the country's resource base were studied; their high adhesion, physical and mechanical characteristics and wear resistance under high-temperature conditions were defined. The thin-film surface structure patterns and properties were investigated with the help of modern physical and chemical methods of analysis. It was determined that the combination of mechanical, physical, and chemical properties of the investigated coatings provides vide opportunities for their usage as effective materials under high-temperature wear conditions. According to the test results, the application of the investigated composite coatings for friction unit efficiency improvement provides their operational reliability in accordance with requirements and opportunities that appear with the development of a new competitive material for wear-resistant coatings obtained with the help of the detonation method. Keywords: detonation coating: wear resistance, surface layer, structural adaptability, temperature.

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“…Authors of the work [3] note that the initial roughness of the friction surfaces undergoes various changes and deformations of the surface layers, which leads to a nonlinear wear rate during running-in. This article presents an experimentally tested model for predicting the development of the running-in process and changes in the friction coefficient, roughness parameters, as a function of running-in time.…”

Section: Literature Reviewmentioning

confidence: 99%

Substantiation of a rational program for the running-in of tribosystems

Vojtov,

Voitov

2023

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The paper presents the results of studies on the justification of a rational program for running-in of tribosystems. It is shown that the first component of the program is the fulfillment of the condition on the verge of loss of stability due to the appearance of accelerated wear, with the maximum load on the tribosystem and the minimum sliding speed. This mode performs the function of "training" the surface layers for future operating conditions due to deformation processes and changes in the roughness of the friction surfaces. The mode is characterized by minimum wear rate values and maximum friction coefficient values. The second component of the running-in program is the fulfillment of the condition on the verge of loss of stability due to the appearance of burrs on the friction surfaces, with minimal load on the tribosystem and maximum sliding speed. This mode performs the function of "adaptation" of the surface layers to the future operating conditions by increasing the rate of deformation of the materials of the surface layers on the spots of actual contact. The mode is characterized by maximum wear rate values and minimum friction coefficient values. The third mode of the program aims to form surface structures and roughness on the friction surfaces of tribosystems that correspond to operational modes. This mode performs the function of "sufficient adaptation" of the surface layers to the future operating conditions, and corresponds to the condition with the maximum value of the stability margin. The final result of the running-in process is the transition of the tribosystem from an unbalanced, thermodynamically unstable state to a stationary, equilibrium state, as a result of which such parameters as wear rate, friction coefficient, temperature and roughness of the friction surfaces are stabilized. Such a step-by-step transition is associated with the formation of a special, dissipative structure of the surface layers of triboelements as a result of self-organization. The use of the three-mode program will reduce the time for tribosystems to run in by 23.0 - 38.4% compared to other programs. The effectiveness of the developed three-mode program is proven by experimental studies with the calculation of the modeling error.

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Experimentally verified prediction of friction coefficient and wear rate during running-in dry contact

Cited by 31 publications

References 31 publications

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

Investigation of the wear behavior of FeNi36 alloy cut by WEDM method under different loads

Nanocomposite coatings for wear protection at high temperatures

Substantiation of a rational program for the running-in of tribosystems

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