Micro-structural characterisation and performance analysis of textured AlCrSiTiN coatings

The preparation of micro-textures on the surface of cutting tool substrates can significantly improve the cutting performance and service life of cutting tools, but different types of micro-textures have different anti-friction and wear-resistant effects. Therefore, in this paper, three types of micro-textures (round pit, V-shaped and groove-shaped) were prepared on the surface of cemented carbide samples and coated with AlCrSiTiN composite coating. A micro-performance testing platform for cemented carbide surfaces was constructed, and fractal dimension and digital image analysis techniques were used to characterise the phase composition, surface morphology, grain size and micro-hardness of cemented carbide surfaces under different preparation parameters. Based on the GRA-TOPSIS evaluation method, the micro-performance and morphology of round pit, V-shaped and groove-shaped cemented carbide surfaces were comprehensively evaluated. Research findings indicate that laser power significantly influences overall performance. The optimal preparation parameters for the three texture types are as follows: Circular pitted texture: p = 35 W, v = 1700 mm/s, n = 7 passes, γ = 17%; V-shaped texture: p = 35 W, v = 300 mm/s, n = 5 passes, γ = 9%; groove-shaped texture: p = 35 W, v = 700 mm/s, n = 7 passes, γ = 17%.