Friction and Wear Performance of Different Forming Surfaces of Ti6Al4V Alloy Formed by Selective Laser Melting

Ti6Al4V titanium alloy was prepared by selective laser melting (SLM) technology. The effects of different forming surfaces (XOY, XOZ) and different loads (20, 40, 60, 80 N) on the friction and wear properties of Ti6Al4V alloy were studied. The friction and wear properties of different forming surfaces were evaluated by friction coefficient (COF) combined with wear volume loss, and the wear track morphology and wear mechanism were characterized by optical microscope (OM) and three-dimensional profile measuring instrument. The results show that compared with the XOZ surface, the wear volume of the XOY surface is reduced by 0.27x10(-5) mm(3) when the normal load is 20 N, and the average friction coefficient is smaller. However, when the load is greater than 20 N, the wear volume and average friction coefficient of XOY surface are larger than those of XOZ surface. The depth and width of the plough groove of the worn track increase with the increase of the load. The plough groove exhibits obvious peeling behavior, and there is a blocky adhesive distributing on the track, causing adhesive wear and oxidative wear. From the aspects of friction coefficient, wear volume and micro-morphology, it is quantitatively reflected that XOZ surface of Ti6Al4V alloy formed by SLM has better friction and wear performance than XOY surface, and XOY surface shows better wear resistance only under low load.

Automated summary

The effects of different forming surfaces and loads on the friction and wear properties of Ti6Al4V alloy prepared by SLM were investigated. The results showed that XOZ surface had better friction and wear performance than XOY surface, except for better wear resistance of XOY surface under low load conditions.