Comparison of scratch resistance of lamellar and compacted graphite irons used in cylinder liners

• DOI: 10.1007/s40430-016-0690-8
• Publication Date: 2016-11-26T10:18:24Z
• Authors: João Luiz do Vale; Matheus Cortz; Vinicius Moreira ...; Carlos Henrique d...; Giuseppe Pintaude
• Keywords: Scratch

Linear scratch tests were performed on polished surfaces extracted from different cylinder liners, manufactured in lamellar and compacted graphite irons. The effect of wall thickness was evaluated, by extracting samples from regions equivalent to two levels of thickness. Scratch geometry was analyzed using 3D interferometry, in terms of pile-up proportion and widths of tracks, and wear mechanisms were revealed under a scanning electron microscope. Overall friction coefficients could be related to the deformation of metallic matrix and the graphite count, while graphite affected the scratch geometry, especially their widths along the sliding distance. The larger variation and higher friction amongst the tested materials were observed for compacted graphite iron, extracted from the thick wall. The observed wear mechanisms were also verified in worn components subject to abrasive environments.