Fiber Laser Peening of Ti6Al4V Alloy Considering the Effects of Laser Power, Scan Speed and Overlap Rate on Surface Morphology and Roughness

<span class="fontstyle0">This research work has been carried out with attention to how the LP technique can change both<br>the surface topography and roughness of the Ti6Al4V alloy by changing some of the most relevant<br>parameters: power of laser, scan speed, and overlap rate. The Ti6Al4V alloy is considered for its<br>exceptionally great strength-to-weight ratio besides being rated for excellent corrosion resistance and<br>biocompatibility. In the experiment, the variation in the laser power varied from 10 to 30 W, the scan speed<br>from 250 to 500 mm/s, and the overlap rate from 20% to 40% using a factorial design method to study the<br>effects on surface texture. The surface morphology was characterized by optical microscopy and<br>profilometry. With higher laser power, the surface is bound to be more irregular with higher valleys and<br>peaks due to the higher material ablation rate, while at bigger scan speeds, the surface tends to be smoother<br>due to lower energy input per unit area. The rate of overlap significantly influenced the uniformity of the<br>surface-the higher the rate, the more homogeneous the texture of the surface would be. It has also been<br>observed from the results that low laser power and high scanning speed combined to form a smooth surface,<br>while a high overlap rate improved uniformity. For this reason, the present results are important for the<br>understanding of the laser processing parameters with respect to surface topography in Ti6Al4V and as<br>such improves its applications in industries where stringent surface modification requirements are required.</span> <br style="font-variant-numeric: normal; font-variant-east-asian: normal; font-variant-alternates: normal; font-variant-position: normal; line-height: normal; text-align: -webkit-auto; text-size-adjust: auto;">