ВЛИЯНИЕ МОЩНОСТИ ЛАЗЕРНОГО ИЗЛУЧЕНИЯ И СКОРОСТИ ДВИЖЕНИЯ ЛУЧА НА ГЕОМЕТРИЮ ЗОНЫ ОПЛАВЛЕНИЯ ПРИ ЛАЗЕРНОЙ ЗАКАЛКЕ СТАЛИ 40X

Abstract

The improvement of operating characteristics of the working surfaces of machine parts, tooling and metal cutting tools is important for the modern industry. Laser hardening is one of the most intensively developing methods of improvement of friction surfaces wear resistance. Laser hardening of treated surface is possible from liquid or solid state. The largest values of depth and width of a hardened layer are achieved when laser hardening from the liquid state. The application of laser hardening with surface flashing is possible for a large range of body parts. In this regard, the study of hardened zones structure and the selection of modes that cause the maximum hardened layer characteristics are important for the implementation of laser hardening technology under factory conditions. The paper presents the results of experimental study of the influence of the emission power of the quasi-continuous fiber optic ytterbium laser and laser beam velocity on the geometry of 40H steel flashing zone, not including changes in heat-affected zone geometry. Using the LK-150/1500-QCW-AC laser emitter, the authors formed on the surface of 30105 mm samples the isolated thermal wake with distinctively noticeable fluxed zone and then studied the cross-section of this wake using the LaboMet-1 microscope. In the result of the study of fluxed zone cross-section geometric characteristics, the authors determined the treatment modes at which the fluxed zone cross-section appearance changed and defined its width and depth depending on the laser emission power. Laser treatment modes are defined when the largest difference between the fluxed zone depth and the depth of the crater formed on steel surface is achieved.