LASER HARDENING OF WORKING SURFACES OF MACHINE PARTS

Abstract

The work investigates the processes of laser modification of anodized coatings of alloy D16. It has been shown that the use of laser radiation makes it possible to increase the wear resistance and microhardness of the surface due to the formation of a dispersed-hardened layer. Experimental studies have been conducted on the effect of laser processing parameters – pulse energy, power density, and radiation point displacement - on the structure and properties of anodized coatings. It has been found that optimal treatment modes (E = 5-7. 5 kJ, q = 20-30 kW/cm2, ∆F = -22 cm) ensure a minimum amount of wear (6-8 microns) and a uniform microstructure of the hardened layer. Electron microscopy revealed the crystallization of an amorphous oxide layer and the formation of a dense nonporous structure under laser exposure. Laser modification of anodized coatings increases not only the wear resistance, but also the corrosion resistance of the material, which increases the strength of machine parts and mechanisms.