Properties of composite micro-textured surface on YG8 cemented carbide prepared by laser peening and ablation

Abstract

This paper proposes a novel method for fabricating composite micro-textured surfaces using a combined laser processing technique. The method integrates laser peening without coating and laser ablation texturing in the air to create composite micro-textured surfaces on YG8 cemented carbide. The study examines the microstructure, roughness, hardness, residual stress, friction-wear performance, and cutting performance of composite micro-textured surfaces. Experimental results indicate that laser treatment significantly alters the microstructure and surface properties of cemented carbide. In particular, the composite micro-textured surface (LP-T) achieved by combining laser peening and ablation, demonstrated the highest surface hardness (1579 HV). It also shows an improved surface contact ratio and a balanced residual stress distribution (231.8 MPa). The average friction coefficient was the lowest, reduced by 19.4 % compared to traditional polished surfaces. Additionally, the composite treatment significantly lowers cutting force and temperature at higher cutting speeds, improving adhesive wear on the cutting face. In conclusion, the laser composite treatment substantially enhances the performance of cemented carbide by optimizing its surface characteristics.