Effect Of Solid Particles On Wear Behavior And Mechanism Of TC4 Alloy

Titanium alloys have been widely used in various industrial fields for its excellent performances. but the poor wear resistance severely precluded their applications. Improving the wear resistance is the key to expand its application. The friction and wear properties of TC4 alloy was studied by supplying different particles onto the interface artificially between TC4 alloy/GCr15 steel. The morphologies, compositions and structures of worn surfaces, cross-section subsurfaces were observed and measured thoroughly by using SEM, EDS, XRD, et al. The wear mechanism of titanium alloys, as well as the formation and effect of tribo-layer on wear resistance were explored.The experimental results showed that different particles made significant difference on the wear behaviour and wear performance of TC4 alloy. The wear loss increased linearly while no additives、MoS2 or MoS2+20%Fe2O3 particles were supplied onto the interface. The wear loss of Ti6Al4 V was almost constant, being close to zero and fluctuates slightly with the increase of normal load varying from 10 to 40 N while MoS2+50%Fe2O3、MoS2+80%Fe2O3 or Fe2O3 particles were supplied onto the interface; while the MoS2+50%Fe2O3 and Fe2O3 particles were supplied, the wear loss of TC4 alloy was slightly higher than that of MoS2+80%Fe2O3.It was noticed that tribo-layers always existed on the dry sliding surfaces of titanium alloys. The different structures and compositions of the tribo-layer resulted in the different friction and wear properties of TC4 alloy while adding different particles. Adhesive and abrasive wear mechanisms prevailed when there was no additives. The main wear mechanism was the mild wear attributed to the protection of tribo-layers at the load of 10 N.The wear mechanism change to adhesive and abrasive wear with the increase of load when MoS2 and MoS2+20%Fe2O3 particles were supplied. The main wear mechanism was always the mild wear when MoS2+50%Fe2O3 、MoS2+80%Fe2O3 and Fe2O3 particles were supplied onto the interface. However, the wear mechanism change to adhesive wear and abrasive wear at the load of 50 N when MoS2+50%Fe2O3 particles was supplied. As the continuous particle layer covered worn surface of TC4, severe-to-mild wear transition occurred.