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Influence of Surface Laser Treatment on Mechanical Properties and Residual Stresses of Titanium and its Alloys
 
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1
Department of Biomaterials Technology, Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, 80-233 Gdansk, Poland
 
2
Institute of Optoelectronics, Military University of Technology, gen. Sylwestra Kaliskiego 2/Budynek nr 136, 00-908, Warszawa, Poland
 
3
CNRS, Institute of Mechanics and Engineering, University of Bordeaux, 351 Cours de la Libération CS10004, 33400 Talence, France
 
 
Corresponding author
Magdalena Jażdżewska   

Department of Biomaterials Technology, Institute of Manufacturing and Materials Technology, Faculty of Mechanical Engineering and Ship Technology, Gdansk University of Technology, 80-233 Gdansk, Poland
 
 
Adv. Sci. Technol. Res. J. 2023; 17(6):27-38
 
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ABSTRACT
Surface modification of the titanium and its alloys used in implantology with a long-pulse laser can change the surface topography, but it also leads to changes in the stress sign and magnitude in the resulting subsurface layer. The presented research was aimed at evaluating the state of stress after laser remelting with the Nd:YAG laser of pre-etched titanium alloys Ti6Al4V and Ti13Nb13Zr and pure titanium. The obtained surface layers were characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), optical profilography, and nanoindentation studies. Based on the results obtained after the nanoindentation tests, the character of the stresses generated in the melted layers was calculated and determined. Laser processing resulted in surface layer thicknesses between 191-320 µm and surface roughness Ra between 2.89-5.40 µm. Laser processing caused increasing hardness, and its highest value was observed for the titanium alloy Ti13Nb13Zr - 5.18 GPa. The tensile stresses appeared following laser treatment and increased with elevating laser power up to the highest value for titanium.
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