Comparison of wear properties of commercially pure titanium prepared by selective laser melting and casting processes

Abstract

The present study investigates the wear properties of commercially pure titanium (CF-Ti) parts produced using selective laser melting (SLM) and casting. Scanning electron microscopy (SEM) investigations show that SLM-produced CF-Ti parts have martensitic (alpha') microstructure, whereas castimoduced CP-Ti samples exhibit plate-like (alpha) microstructure. SEM studies on the wear surfaces at moderate loads (15 N) show shallow ploughing grooves at certain regions and some delamination cracks for both SLM and cast CP-Ti samples. On increasing the load to 30 N, deeper ploughing grooves were observed in both samples along with delamination of material at certain regions. However, ploughing grooves were found to be very shallow in SLM samples compared with the cast parts. Although both SLM and cast CP-Ti exhibited similar wear mechanisms, SLM CF-Ti showed better wear resistance due to its martensitic microstructure, finer grain size and superior microhardness. (C) 2014 Elsevier B.V. All rights reserved.