Abstract
Most of the current works based on surface treatments of metals by laser marking technology are focused on the modification of the color tonality of flat surfaces, or the development of specific topography features, but the combination of both processes is not usually evaluated, mainly due to the complexity of controlling the optical properties on rough surfaces. This research presents an analysis of the influence of the micro-geometrical characteristics of periodic patterned laser tracks on the chromaticity and reflectance of Ti6Al4V substrates. The samples were irradiated with an infrared nanosecond pulsed laser in air atmosphere, taking as the control parameter the scan speed of the beam. A roughness evaluation, microscopic inspection, and absorption and chromaticity examination were conducted. Although micro-crack growth was detected in an isolated case (10 mm/s), the possibility of adjusting the result color was demonstrated by controlling the heat-affected zone thickness of the textures. The results of rough/colored combined textures allow new perspectives in industrial design to open, particularly in aesthetic applications with special properties.
Highlights
Surface texturing has recently grown in importance in engineering applications, resulting in significant improvements in load capacity, wear resistance, and the friction coefficient of tribo-mechanical parts
These treatments are usually based on laser irradiation processes in air atmosphere, avoiding the use of lubricants or coolant fluids that is necessary in some machining processes [3]
The main alterations on the substrate can be related to micro-geometrical changes of the surface and color tonality variations of the samples
Summary
Surface texturing has recently grown in importance in engineering applications, resulting in significant improvements in load capacity, wear resistance, and the friction coefficient of tribo-mechanical parts. The selection of parallel linear displacements aims to develop laser tracks that can be used as micro-channels for controlling the fluid distribution on the surface This effect allows wear resistance to be improved under lubricated conditions of the substrate [14,15]. There are some works that relate to the influence of LST parameters on the color of textured surfaces These mainly evaluate the optical properties (n, k) of oxide films using spectrophotometry and ellipsometry techniques [24,25,26,27,28,29]. These measurements are useful for calculating spectral reflectance and can be compared with the data measured by a spectroscope. LST parameters in the texturing of Ti6Al4V are key for the control of surface morphology, which can be directly linked with the chromatic state
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