METHOD FOR NITRIDING PARTS FROM ALLOYED STEEL Russian patent published in 2022 - IPC C23C8/26 C23C8/02 C23C8/36 

FIELD: metallurgy.

SUBSTANCE: invention relates to a method for nitriding a part made of alloy steel. The method includes placing a part in a working chamber, activating the surface of the part before nitriding, supplying a working saturating medium to the chamber, heating the part to the nitriding temperature and holding the part at this temperature until the required thickness of the nitrided layer is formed, while activating the surface of the part before nitriding is carried out in two stages, at the first stage, surface plastic deformation of the part is carried out, providing from 1.1 to 1.2 times the excess of the thickness of the layer changed as a result of surface plastic deformation over the thickness of the formed nitrided layer, and then, at the second stage of activation, high-energy ion-implantation treatment of the surface of the part with nitrogen ions is carried out, which ensures the formation of radiation defects of the crystal structure in the surface layer of the part to the depth of nitriding, providing an equal process of nitrogen diffusion inside the metal grains and along their boundaries, and high-energy ion-implantation treatment the surface of the part is carried out at an ion energy from 20 to 24 keV, an irradiation dose from 1,2⋅10¹⁷ cm^-2 to 1.3⋅10¹⁷ cm^-2, a rate of radiation dose increase from 0.7⋅10¹⁵ s^-1 to 1.2⋅10¹⁵ s^-1, and surface plastic deformation is carried out with an ultrasonic tool at a frequency f=17-20 kHz and an amplitude ξ_m=4-16 mcm of acoustic vibrations and a pressing force of 40-160 H to the part, and ion nitriding is used as a method for nitriding nitriding.

EFFECT: increasing the productivity and quality of the nitriding process, as well as increasing the wear resistance of the nitrided layer of alloy steel parts.

1 cl, 3 tbl, 1 dwg