Dry sliding wear behaviour of cast roller materials

In this study, wear behaviour of roller materials produced by different casting techniques was investigated. Static and centrifugal casting techniques were used to produce roller materials having pearlitic and martensitic matrices due to the processing method and alloy composition. The roller materials were examined using light and scanning electron microscopes to determine the matrix phase. The samples were tested using 'ball-on-disc' type tribometer to study the wear characteristics of cast morphologies. DIN 100Cr6 steel ball with a 5 mm diameter was used as counterface, load force was selected as 50 N and total sliding distance was 500 m. After wear tests, the surfaces of cast parts were examined by light and scanning electron microscopes to evaluate the wear mechanisms under dry sliding condition. The friction coefficient, weight loss and type of wear mechanisms were determined. It was concluded that the material having finer martensitic matrix produced by centrifugal casting had a higher wear resistance than the one produced by static casting.