Surface topography and friction coefficient evolution during sliding wear in a mixed lubricated rolling-sliding contact

Pei, Xin; Pu, Wei; Zhang, Ying; Huang, Lu

doi:10.1016/j.triboint.2019.05.013

Cited by 59 publications

(30 citation statements)

References 24 publications

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“…The reduction in friction coefficient of both the UNSM-treated single and double layers can mainly be attributed to the increase in surface roughness, where the increased hardness is responsible for the increase in wear resistance. As mentioned previously, the friction coefficient and wear rate may be affected by the real contact area due to high surface roughness [26,38]. The friction coefficient reduction and wear resistance enhancement of AM materials by UNSM treatment can be found in previous studies [13,16,29].…”

Section: Variation In Tribological Characteristicsmentioning

confidence: 72%

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

et al. 2020

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This study introduces a newly developed cladding device, through printing AISI 1045 carbon steel as single and double layers onto American Society for Testing and Materials (ASTM) H13 tool steel plate. In this study, the mechanical and tribological characteristics of single and double layers were experimentally investigated. Both layers were polished first and then subjected to ultrasonic nanocrystal surface modification (UNSM) treatment to improve the mechanical and tribological characteristics. Surface roughness, surface hardness and depth profile measurements, and X-ray diffraction (XRD) analysis of the polished and UNSM-treated layers were carried out. After tribological tests, the wear tracks of both layers were characterized by scanning electron microscopy (SEM) along with energy-dispersive X-ray spectroscopy (EDX). The surface roughness (Ra and Rz) of the single and double UNSM-treated layers was reduced 74.6% and 85.9% compared to those of both the as-received layers, respectively. In addition, the surface hardness of the single and double layers was dramatically increased, by approximately 23.6% and 23.4% after UNSM treatment, respectively. There was no significant reduction in friction coefficient of both the UNSM-treated layers, but the wear resistance of the single and double UNSM-treated layers was enhanced by approximately 9.4% and 19.3% compared to the single and double polished layers, respectively. It can be concluded that UNSM treatment was capable of improving the mechanical and tribological characteristics of both layers. The newly developed cladding device can be used as an alternative additive manufacturing (AM) method, but efforts and upgrades need to progress in order to increase the productivity of the device and also improve the quality of the layers.

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Section: Variation In Tribological Characteristicsmentioning

confidence: 72%

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

et al. 2020

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“…where ω is the rotational speed of the lower specimen, and r, the rotation radius of the lower specimens. The friction of ferroalloy and wet granulation sulfur is an extremely complex process, and changes in the physicochemical properties of sulfur, or the morphology and composition of the friction surface will cause a change in the friction coefficient [21][22][23]. Therefore, the friction coefficient cannot be considered a fixed value for the calculation of frictional heat, but should instead be calculated according to the monitored friction torque during the test process.…”

Section: Experiments Methodsmentioning

confidence: 99%

Study on Friction Behavior of Ferroalloy and Wet Granulation Sulfur under Low Normal Load Conditions

Dai

Fan

et al. 2019

Metals

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To study the friction behavior of ferroalloy and wet granulation sulfur under low normal load conditions, a series of experiments were performed using a homemade rotating test apparatus. Scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS) and X-ray diffraction (XRD) were utilized to examine the friction products. The experimentally monitored friction coefficient data were used to develop a finite element model to simulate the temperature field and a theoretical model to calculate the flash temperature of the contact area of the friction surface. The experimental, simulation, and theoretical results showed that the flash temperature of the friction surface is much higher than the average temperature of the friction surface and allows the reaction of iron and sulfur to form iron–sulfide compounds.

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“…The lubricant in the simulation is assumed to be purely base oil, though additives are often added in commercial lubricants to improve lubrication properties. The lubricant has a viscosity of 0.023 Pa s, a pressure-viscosity coefficient of 12.51 GPa 21 , and a density of 0.88 g/cm 3 . The effect of temperature on viscosity and density is ignored.…”

Section: Simulation Parametersmentioning

confidence: 99%

Friction and adhesive wear behavior caused by periodic impact in mixed-lubricated point contacts

Pei

Yang

et al. 2020

Advances in Mechanical Engineering

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Periodic impact is a common phenomenon experienced by functional components. The mechanisms governing the adhesive wear growth caused by the periodic impact are not well understood, which limits the development of antiwear and lubricating behavior. In this work, the periodic impact action caused by rubbing surface velocity and contact load is studied in the sliding wear process under mixed lubrication condition. At each wear simulation circle, the material removal at each asperity contact location is evaluated and the surface topography is renewed correspondingly. The evolutions of friction and wear track are revealed during wear process. We find that the friction coefficient changes periodically caused by the periodic speed, and the wear rate increases almost linearly with either speed period or speed amplitude. The load impact results in an abrupt variation in friction coefficient, while it appears to be limited in adhesive wear state compared to speed, highlighting the critical role of velocity impact in wear formation.

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Surface topography and friction coefficient evolution during sliding wear in a mixed lubricated rolling-sliding contact

Cited by 59 publications

References 24 publications

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

Mechanical and Tribological Characteristics of Cladded AISI 1045 Carbon Steel

Study on Friction Behavior of Ferroalloy and Wet Granulation Sulfur under Low Normal Load Conditions

Friction and adhesive wear behavior caused by periodic impact in mixed-lubricated point contacts

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