Microstructure and Hardness of the Laser Surface Treated Titanium
Surface modification is a promising technique to improve wear properties of titanium and titanium alloys by modifying either the surface composition or microstructure. Laser remelting and laser nitriding of commercial purity titanium were carried out under pure argon and pure nitrogen ambient, respectively. Characterization of the laser treated surface was done by optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), microhardness tester. During laser irradiation heating, Ti exhibits a height activity and combines with N in the atmosphere of pure nitrogen forming TiN and TiN0.3, whereas Ti only transform into martensitic Ti in pure argon. The Vickers microhardnesses are greatly improved by laser remelting and laser nitriding.
Yu Zhou, Shan-Tung Tu and Xishan Xie
J. B. Zhang et al., "Microstructure and Hardness of the Laser Surface Treated Titanium", Key Engineering Materials, Vols. 353-358, pp. 1745-1748, 2007