Tribological performance assessment of lamellar and compacted graphite irons in lubricated ring-on-cylinder test

Vale, João Luiz do; Silva, Carlos Henrique da; Pintaúde, Giuseppe

doi:10.1016/j.wear.2019.02.020

Cited by 15 publications

(12 citation statements)

References 24 publications

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“…This result can be associated with the higher deformation on the softer material. Looking at the findings reported by Vale et al [15], they found a more considerable amount of these elements on the liner surface. However, in that case, the rings were much harder, manufactured with a hard nitrided layer.…”

Section: Friction Behavior and Chemical Analysismentioning

confidence: 74%

“…A previous investigation found no differences in COF between pearlitic and austempered microstructures in different cast irons under dry sliding tests [11]. Considering the differences in the test setup, Vale et al [15] have found a similar value for CGI liners tested against rings manufactured with nitrided steel. These researchers used the same lubricant oil but under milder conditions (75 N of applied load and oil temperature of 40 °C).…”

Section: Friction Behavior and Chemical Analysismentioning

confidence: 91%

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Effect of austempering treatment on lubricated sliding contact of compacted graphite iron

2020

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Significant research has been done to improve the wear properties of the components used in internal combustion engines. Excessive wear is observed in components such as cylinder liners and rings, which can lead to lower volumetric efficiency of the engine, increase oil consumption, polluting emissions, and scuffing related issues. Since tribological systems in internal combustion engines are complex, the different wear mechanisms involved need to be investigated to improve the life of components. Cast irons are commonly used for engine components, especially compacted graphite irons (CGI) for piston rings and gray cast irons (GCI) for cylinder liners. This work aims to evaluate the tribological behavior of two different microstructures of CGI (pearlitic and ausferritic), sliding on pearlitic GCI. The samples of CGI with different microstructures and hardness were evaluated in a short-stroke reciprocating sliding tester, using Petronas Urania SAE 30 API CF lubricant oil at 100 °C for four hours. The characterization of worn surfaces was made using a scanning electron microscope (SEM) and 3D roughness measurements. The coefficient of friction (COF) comparison between the two CGI microstructures showed very similar results with COF = 0.11. The pearlitic CGI showed more severe wear than the austempered one, confirmed by SEM images and the difference in topography parameters before and after the tests. Phosphorus, sulfur, and zinc were detected by EDS analyses in the samples' worn-out regions, indicating the formation of tribo-films, which was further confirmed by the friction tests.

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Section: Friction Behavior and Chemical Analysismentioning

confidence: 74%

Section: Friction Behavior and Chemical Analysismentioning

confidence: 91%

Effect of austempering treatment on lubricated sliding contact of compacted graphite iron

2020

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“…In terms of tribological response, compacted graphite iron (GJV450) performed better than gray cast iron under lubricated conditions [13]. However, under severe contact conditions (boundary lubrication), the performance of GJV500 was not much superior to that presented by GJV450 [14].…”

Section: Introductionmentioning

confidence: 99%

The effect of graphite number per area on tribological behavior of high-strength compacted cast irons in lubricated tests

Pintaúde¹,

Wollmann²

2022

Tecnol. Metal. Mater. Min.

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“…This is due to the SPN process conducted at low temperature and short processing time. Figure 144a, Figure 144b and Figure 144c present the (110), (112) and (300) ε-nitride peaks in formatted scale charts. Therefore, they can be clearly registered for further considerations and future works.…”

Section: X-ray Diffraction (Xrd) Analysismentioning

confidence: 99%

“…(1) Investigate the effect of SPN on friction and wear behaviors of GCI pre-textured specimens, assessed in a ring-on-cylinder test [112] under boundary, mixed, and hydrodynamic lubrication regimes. The tests will be performed using in-lab textured flat specimens, and as-honed cylindrical surface of an internal combustion engine cylinder.…”

Section: Suggestions For Future Researchmentioning

confidence: 99%

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

Filho¹,

dos²

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A concept of plasma treatment for enhancing pre-textured surfaces of components made in pearlitic gray cast iron is proposed. It consists of a plasma nitriding at low temperatures and short times, in order to increase the hardness of the surface by means of a shallow depth nitride formation in the surface of the iron. As a result, the roughness pattern of a previously textured surface is preserved after the treatment. A review on the wear of internal combustion engine cylinders along with background research was conducted, which consisted in the description of cylinder bore wear features observed experimentally. The background research substantiated the significance of initiatives to enhance wear and friction response of pre-textured surfaces made of cast iron, such as the internal combustion engine cylinders. A series of plasma nitriding experiments was run on specimens extracted from engine cylinders. Flat specimens, obtained from blanks extracted from the cylinder wall of an engine cylinder block, were textured in laboratory in order to emulate the typical roughness distribution of an ordinary cylinder bore plateau honing process. Complementarily, a case-study experiment was performed in a honed sample of an internal combustion engine cylinder, whose surface in its original form (cylindrical) has been textured through industrial honing operations. Therefore, one among the potential applications of the research has been assessed. 3-D interference roughness measurements were performed before and after the plasma treatment to assess topographic stability of the textured surfaces. ε-Iron nitride (Fe 3 N) formation was identified via X-ray diffraction analysis. In addition, nitrogen concentration profile was quantitatively evaluated using wavelength-dispersive (X-ray) spectroscopy microanalysis, substantiating the nitride formation at shallow depth. Microhardness measurements and instrumented linear sclerometry test ('scratch test') results indicated that ε-iron nitride formation and solid solution hardening could provide enhanced properties to the surface of general pearlitic cast iron components, such as increase of wear resistance, and decrease of apparent coefficient of friction, in the assessed conditions. The results demonstrated that the roughness texture pattern was satisfactorily preserved after the treatment, which was supported by direct observation of the surfaces via scanning electronic microscopy.

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Tribological performance assessment of lamellar and compacted graphite irons in lubricated ring-on-cylinder test

Cited by 15 publications

References 24 publications

Effect of austempering treatment on lubricated sliding contact of compacted graphite iron

Effect of austempering treatment on lubricated sliding contact of compacted graphite iron

The effect of graphite number per area on tribological behavior of high-strength compacted cast irons in lubricated tests

On the plasma-assisted modifications of pre-textures surfaces: shallow depth nitriding in cast iron, topography and instrumented sclerometry test response.

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