Influence of Material Nature and Surface Texturing on Wear of Heavy-Duty Diesel Engine Cylinder Liners

摘要

The aim of this work is to study the influence of the material (chemical composition and mechanical properties) and the surface texturing on wear of heavy-duty diesel engine cylinder liners. Three kinds of lamellar grey cast iron have been studied: a classical grey cast iron, a surface-quenched grey cast iron, and a micro-alloyed grey cast iron. Honed samples have been tested with different surface roughness parameters. Reciprocating friction tests with the configuration "sphere against a piece of cylinder liner" in lubricated contact have been carried out on a Cameron-Plint test rig. The friction coefficient and the electrical contact resistance were measured during the test. The tribo-chemical film formation on the wear scars has been studied after different test durations (during and after the running-in stage). The wear volume of the cylinder and the sphere has been determined. Surface heat treatment and phosphorus eutectics can improve the tribo-chemical film formation and the wear resistance of cylinder liners. Moreover, the surface topography has an important influence; a flat surface with deep valleys shows a better wear resistance than a surface with lots of asperities.