Tribological performance of micro textured surface machined by Nd:YAG laser with different incident angle

In this paper, the linear micro textures were fabricated on the cemented carbide surface by Nd:YAG laser with different incident angle. The morphologies of micro textures, residual stress and laser machining temperature were investigated by experiments and simulations. The friction properties of the textured samples and conventional polished samples were carried out by dry reciprocating sliding tests against 304 stainless steel balls. The experiments and simulations results indicated that with the decreasing of the laser incident angle, the depth of micro textures, laser machining temperature and residual compressive stress inside the micro textures were reduced, and the width of the micro textures and surface roughness were increased. In comparison with conventional polished samples, the micro textured samples exhibited better friction performance, especially for the TS-60 samples, the wear rate of the balls and average coefficient of friction were reduced about 71.1% and 63.2%, respectively. The worn surface of TS-60 samples also showed the smallest worn scratch width about 443 mu m and a small quantity of adhesions. The mechanism of the micro textures geometry structure on the friction performance was discussed.

Automated summary

This study investigates the fabrication of linear micro textures on cemented carbide surfaces using Nd:YAG laser at different incident angles. The results show that decreasing the incident angle reduces the depth of micro textures, laser machining temperature, and residual compressive stress. It also increases the width of the micro textures and surface roughness. The micro textured samples demonstrate improved friction performance, with the TS-60 samples showing the best results, reducing the wear rate and average coefficient of friction by approximately 71.1% and 63.2%, respectively.