Titanium
alloy surface was strengthened by means of arc-added glow discharge plasma non-hydrogen carburizing. Thus high purity and high strength graphite was selected as the cooling cathode arc source for supplying carbon atoms and particle which migrated to the
Titanium alloy (Ti6Al4V) surface and formed the
carburizing modified layer, and the hydrogen-induced embrittlement of the titanium alloy in conventional carburizing was therefore avoided as well. The phase structure and morphology of the carburizing modified layer were analyzed by means of X-ray diffraction and scanning electron microscopy. The chemical states of the C element in the carburized layer were determined using X-ray photoelectron spectroscopy. The
friction and wear behavior of the carburizing modified layer under dry sliding against SAE52100 steel was evaluated on a ball-on-disc test rig, and the worn surface morphology of the modified layer was observed using a scanning electron microscope. The results showed that it was feasible to prepare a modified layer of 30 μm thick by the carburizing at 980 ℃ for 30min. The microhardness of the
Ti6Al4V alloy surface was as high as 936HV, which was much larger than that of the Ti6Al4V alloy. The Ti6Al4V alloy was characterized by adhesion wear and scuffing under dry sliding against the steel, while the surface modified layer experienced much abated adhesion wear and scuffing under the same testing condition. This could be attributed to the strengthening effect of the hard modified layer and to the lubricity of the elemental C and its film in the modified layer.
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