Akademik Veri Yönetim Sistemi
International Journal of Advanced Manufacturing Technology, cilt.125, sa.9-10, ss.4271-4291, 2023 (SCI-Expanded)
The surface of the commercial CoCr28Mo alloy was textured using a 20W pulsed fiber laser according to different beam scan strategies. Surface roughness and drop contact angle measurements made on the textured surface were used to evaluate the effects of process parameters. The surface topography was highly affected by both scan direction and beam overlaps named pulse-to-pulse overlap and scan overlap. As the beam overlap ratio increased, the amount of heat transferred to the unit area also increased, which caused more metal to evaporate in the interaction zone and form a more considerable amount of molten and re-solidified metal layer, resulting in a chaotic texture formation on the surface. The mean surface roughness values of textured surfaces for eighteen test samples ranged from 1 to 7 μm. These surface roughness values were in the micro-scale roughness value range. According to the results of the drop contact angles, the surface topography significantly changed the wettability. The test results were also analyzed by the Taguchi method considering signal-to-noise ratios and evaluated by analysis of variance. Considering the highest S/N values for each parameter, the optimum parameters combination for the laser engraving process was 45°/-45° for scan direction, 70 % for power, 1000 mm/s for scan speed, 50 kHz for frequency, 0.01 mm for hatch distance, and 75 ns for pulse duration.