METHOD FOR NITRIDING PARTS FROM ALLOYED STEEL Russian patent published in 2023 - IPC C23C8/02 C23C14/48 C21D1/04 C21D10/00 

FIELD: metallurgy.

SUBSTANCE: invention is related to methods of chemical and thermal treatment of alloy steel parts and can be used in mechanical engineering for surface hardening of machine parts, including parts operating in friction pairs, gears and rotors of screw pumps and engines. 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 at this temperature until the required thickness of the nitrided layer is formed. At the same time, the activation of the surface of the part is carried out in two stages, first, high-energy ion-implantation treatment of the surface of the part with nitrogen ions is carried out at the energy of ions that form radiation defects in the crystal structure in the surface layer of the part to the depth of nitriding, ensuring an equal process of nitrogen diffusion both inside the metal grains and along their boundaries, and then magnetic-pulse processing is carried out, which ensures a uniform layer-by-layer redistribution of radiation defects of the crystal structure over the depth of nitriding.

EFFECT: increase in the efficiency and quality of the nitriding process, as well as an increase in the wear resistance of the nitrided layer.

3 cl, 1 tbl