Increasing the wear resistance of gears during laser hardening

Mechanical Engineering Research Institute of the Russian Academy of Sciences, 4, Maly Kharitonyevsky Pereulok, 101990, Moscow, Russia

^* Corresponding author: laser-52@yandex.ru

Abstract

The paper presents the main results of metallographic studies and tribotechnical tests of steel for the production of 25CrMnTi gears. Quenching of the samples was performed using a defocused and oscillating beam normal to the processing speed vector. Friction and wear tests were performed on a friction machine according to the scheme: “a flat sample with laser hardening-the end of the sleeve of a counter-tile made of 40X steel”, when industrial oil I20 was dripped onto the surface of a sample hardened by a laser beam. It was found that the microhardness of the samples tempered with an oscillating beam was 620-680 HV, which is 60-90 HV higher than when quenched with a defocused beam and 3 times higher than the hardness of the base material. The cross-sectional area of the laser quenching paths with an oscillating beam was 1.65-1.92 times higher. than when processing with an unfocused beam. The sliding speed of samples hardened by an oscillating and defocused beam to jamming is 2 and 2.5 times and the wear resistance is 4.16 and 3.4 times higher, respectively, than 25CrMnTi steel.