Effect of Surface Texture of SLM Forming on Dry Friction and Wear Properties of TC4 Titanium Alloy
TC4 titanium alloy samples with pitted texture on the surface were carried on by a 3D metal printer with se-lective laser melting(SLM)technology,based on the one-step method.Optical camera,ultra-depth of field microscope and scanning electron microscope were employed to investigate the forming quality of pit textures.Laser confocal displacement tester and micro-Vickers hardness tester were used to analyze the surface roughness and surface hardness.The effects of texture density on the tribological properties of TC4 titanium alloy samples under different loads were studied by the tribo-logical wear tester under dry friction conditions.The surface morpholoies before and after the friction test were analyzed by scanning electron microscopy.The results show that the one-step method of SLM forming is feasible to form pit texture on TC4 titanium alloy surface.With the increasing of texture density,the surface roughness of TC4 titanium alloy sample in-creases and the surface hardness decreases.Under dry friction conditions,increasing the texture density of TC4 titanium al-loy sample is beneficial for the collection of wear chips so as to reduce three body wear of the sample,increasing the load is beneficial for improving the contact state of the friction pair.Under 5 N load,the average friction coefficient and wear trace width of the sample with 40％texture density are the smallest,and compared with the TC4 substrate sample,the aver-age friction coefficient and wear trace width are reduced by 12％and 16％respectively.For sample with 40％texture densi-ty,the increasing of loads will cause more wear loss and lower friction coefficient,along with more furrows and fragments on the worn surface.Under dry friction conditions,the surface texture prepared by 3D printing one-step method can signifi-cantly improve the abrasive wear and adhesive wear of TC4 titanium alloy sample.
selective laser meltingtitanium alloysurface texturetexture densitydry friction and wear properties
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