Table 1 - uploaded by Iveta Vaskova
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Grey cast iron belongs to materials for casting production, which have wide application for different industry branches. Wide spectrum of properties of these materials is given by the structure of base metal matrix, which can be influenced with heat treatment. Processes of annealing can be applied for grey cast iron without problems. During heat tr...
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Citations
... No of Samples Description PRCL system 1 (As is scenario) 1 Uncoated cylinder liner interface with Chromium (Cr) coated ring PRCL system 2 6 Titanium nitride (TiN) coated cylinder liner interface with TiN coated piston rings PRCL system 3 6 TiN coated cylinder liner interface with Chromium (Cr) coated piston rings PRCL system 4 1 Uncoated cylinder liner interface with TiN coated ring made of grey cast iron. The grey cast iron is tempered at 300-370 ∘ C range [9]. This range of the tempering temperature is a fundamental challenge to the application of TiN coatings at the PRCL interface of these engines because grey cast iron loses it hardness after tempering. ...
Piston ring and cylinder liner (PRCL) interface is a major contributor to the overall frictional and wear losses in an IC engine.Physical vapor deposition (PVD) based ceramic coatings on liners and rings are being investigated to address these issues. High temperature requirements for applications of conventional coating systems compromise the mechanical properties of the substrate materials. In the current study, experimental investigation of tribo-mechanical properties is conducted for various titanium nitride(TiN)coatedPRCLinterfacesincomparisonwithacommercial PRCL system. Low-temperature PVD based TiN coating issuccessfully achieved on the grey cast iron cylinder liner samples. Surface roughness of the grey cast iron cylinder liner substratesand the thickness of TiN coating are varied. A comprehensive comparative analysis of various PRCL interfaces is presented and allthe trade-offs between various mechanical and tribological performance parameters are summarized. Coating thickness between 5and 6 micrometres reports best tribo-mechanical behaviour. Adhesion and hardness are found to be superior for the TiN coatings deposited on cylinder liner samples with higher roughness, i.e.,∼5-micron Ra. Maximum 62 % savings on the COF is reported fora particular PRCL system. Maximum 97% saving in cylinder liner wear rate is reported for another PRCL system.
Grey cast iron is one of the most common engineering materials used to make castings which work in thermal cycling. Under thermal cycling conditions, heat resistance is an important operational property of grey cast iron, which depends to the greatest extent on its structure – size and shape of the graphite inclusions, as well as the metal matrix composition. In this paper, the heat resistance of unalloyed grey cast iron with lamellar and compact graphite distributed in perlitic and perlitic-ferritic metal matrices was determined. The tests were carried out at temperatures of 500 – 800 °C. The results of the studies showed an insignificant difference of perlitic and perlitic-ferritic grey cast iron with lamellar graphite heat resistance. The heat resistance of perlitic ferritic grey cast iron with compact graphite is 16 – 48 % higher than the heat resistance of perlitic ferritic grey cast iron with lamellar graphite. Thus, when the shape of the graphite inclusions changed from lamellar to compact, a significant increase in the heat resistance of unalloyed grey cast iron occurred.
