Инновационная технология скоростного азотирования стали

Abstract

Currently, the development of new resource-saving and economically expedient technologies of combined hardening of steel parts with a significant reduction in the duration of the treatment is an important and urgent task. The aim of this work is to develop high-speed technologies of hardening of details to ensure high operationalproperties of the surface layer of steel. Intensified nitriding process due to the advanced laser surface treatment of steel products. The test material is high quality structural alloy steel 38Cr2MoAl. The laser treatment of steel was carried out on the installation "Latus-31, " according to thefollowing modes: radiation power is 1.0 -0.1 kW, diameter of area offocusing of the beam is 5 mm, the moving speed of the laser beam of 0.5—1.5 m/min. Nitriding was carried out in the environment offinely dispersed nitrogen-containing substances with activators at a temperature of530-560 ‘C for 2-3 hours. The influence of laserpre-treatment of steel to change the depth of the hardened layer. The obtained regularities of the thickness of the hardened layer depending on the change of the movement speed of the laser beam to the surface layers of steel 38 Cr2MoAl treated only with laser technology and combined hardening. It is established that the nitriding after laser treatment increases the thickness of the hardened layer of 1.05—1.59 times, which has a positive effect on the performance properties of detalizaciya the impact ofprior laser treatment of steel to change the •values of the surface hardness. The increase of the speed of movement of the laser beam dramatically reduces the surface hardness of the steel.XRD analysis of the investigated steel in the surface layer confirmed the presence of nitrides