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Effect of austempering treatment on lubricated sliding contact of compacted graphite iron
Univ Tecnol Fed Parana, Curitiba, Parana, Brazil.
Univ Tecnol Fed Parana, Curitiba, Parana, Brazil.ORCID iD: 0000-0001-8215-4481
Jönköping University, School of Engineering, JTH, Materials and Manufacturing. Jonkoping Univ, Sch Engn, Dept Mat & Mfg, Jonkoping, Sweden.ORCID iD: 0000-0003-2698-5445
2020 (English)In: SN Applied Sciences, ISSN 2523-3963, E-ISSN 2523-3971, Vol. 2, no 12, article id 1947Article in journal (Refereed) Published
Abstract [en]

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 degrees 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.

Place, publisher, year, edition, pages
Springer Nature, 2020. Vol. 2, no 12, article id 1947
Keywords [en]
Compacted graphite iron, Austempering, Piston rings, Cylinder liners
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hj:diva-51078DOI: 10.1007/s42452-020-03772-1ISI: 000587307600004Scopus ID: 2-s2.0-85100815400Local ID: HOA;intsam;1505170OAI: oai:DiVA.org:hj-51078DiVA, id: diva2:1505170
Funder
Knowledge Foundation, 20170021Available from: 2020-11-30 Created: 2020-11-30 Last updated: 2023-03-28Bibliographically approved

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Ghasemi, Rohollah

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