METHOD OF CHEMICAL HEAT TREATMENT OF WORKPIECE FROM ALLOYED STEEL Russian patent published in 2017 - IPC C23C14/04 C23C14/24 

FIELD: metallurgy.

SUBSTANCE: method of chemical heat treatment of a workpiece from alloyed steel includes placement of the workpiece into the working chamber, supply into the chamber of the working saturating medium, heating of the workpiece to the temperature of chemical heat treatment and conditioning at this temperature until formation of necessary thickness of the diffusive layer. The diffusion layer is formed in the form of local sections with a total area of 60 to 90% of the surface area of the workpiece surface. Local sections are in the form of circles with a diameter from 0.3 mm to 4 mm, or in the form of ovals from 0.5 mm to4 mm and width from 0.3 mm to 2 mm, or as a combination of circles and ovals of the said sizes. Local areas in the form of circles and/or ovals are formed with a uniform distribution over the surface of the workpiece. Before the chemical-thermal treatment, the surface of the part is activated by ion-implantation treatment at an ion energy of 25 to 30 keV, the radiation dose from⋅ 1.6⋅10¹⁷ cm-2 up to 2⋅10¹⁷ cm^-2⋅ , rate of irradiation dose set from 0.7⋅10¹⁵ c^-1⋅ up to 1⋅10¹⁵ c^-1⋅ and when using as implantable ions elements selected from C, N or a combination thereof.

EFFECT: increased wear resistance of workpieces after chemical-thermal treatment.

12 cl, 1 tbl, 1 ex