METHOD OF COMBINED STRENGTHENING OF PARTS SURFACE Russian patent published in 2019 - IPC C23C4/18 

FIELD: technological processes.

SUBSTANCE: invention relates to the field of hardening and finishing machining of parts and can be used in various fields of mechanical engineering for protecting and hardening the surfaces of parts in order to reduce roughness and increase density. Method of hardening the surface of the steel part includes applying a powder metal coating to the part by plasma spraying and its subsequent plastic deformation with an instrument together with passing an electric current, before plastic deformation, a part with a plasma metal coating is heated to a temperature of 100–600 °C, and plastic deformation is carried out sequentially by three tools installed in the same plane, through which electric current is passed, the width of the contact surface of the tools is determined from the condition: b1=(1÷2)⋅b2=(2÷5)⋅b3, where b1, b2, b3 is the width of the contact surface of the instrument through which electrocontact heating is carried out.

EFFECT: decrease in the residual porosity of the plasma coating and its roughness, increase in cohesive, adhesive strength and microhardness.

1 cl, 3 ex