METHOD FOR SELECTING THE DOSE OF ION IMPLANTATION FOR ACTIVATING THE SURFACE OF AN ALLOY STEEL PART BEFORE NITRIDING Russian patent published in 2023 - IPC C23C14/48 C23C8/36 C23C8/26 

FIELD: alloying.

SUBSTANCE: invention relates to a method of selecting a dose of ion implantation to activate the surface of a part made of alloyed steel before nitriding. Flat specimens of alloy steel for tensile testing of the same shape and dimensions with a thickness equal to the thickness of the specified nitrided layer are used. The energy of the ions is chosen in the range from 18 to 30 keV. The ion-implantation treatment of the mentioned samples is carried out with the energy of nitrogen or chromium ions, or titanium, or vanadium, with an increase in the dose of ion implantation for each subsequent sample in increments that are multiples of the minimum possible dose of ion implantation and used to plot the dependence of the ultimate strength of nitrided alloy steel samples, subjected to pre-activation by ion implantation, on the dose of ion implantation. Nitriding is carried out over the entire thickness of the mentioned samples, the tensile strength of each specified sample is determined, and the dose of ion implantation is selected according to the obtained maximum value of the tensile strength to activate the surface of the alloy steel part before nitriding.

EFFECT: improved quality and wear resistance of the nitrided layer of an alloy steel part due to the selection of the optimal dose of ion implantation before nitriding.

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