Effect of Laser Treatment on Intrinsic Mechanical Stresses in Titanium and Some of Its Alloys

Laser surface treatment conducted at different power levels is an option to modify titanium bone implants produce nano- and microtopography. However, such processing can lead excess mechanical stress within the layer. This research aims calculate level of residual stresses after Ti grade IV, Ti15Mo, Ti6Al7Nb alloys with Nd:YAG laser. Light scanning electron microscopies (SEM), energy-dispersive X-ray spectroscopy (EDS), diffractometry (XRD), optical profilography, nano-indentation tests were applied characterize zone. The laser resulted in a distinct pattern formation remelted zones 66–126 µm thick, roughness values ranging between 0.22 1.68 µm. properties weakly dependent on material composition. caused by moderate, always tensile, increasing loading, was highest for Ti15Mo alloy.