METHOD OF HEAT-TREATED STEEL PARTS SURFACES HARDENING Russian patent published in 2016 - IPC C23C28/04 C23C8/38 B23H5/00 

FIELD: electricity; technological processes.

SUBSTANCE: invention relates to electrophysical and electrochemical parts processing methods, in particular, to spark-erosion alloying with graphite electrode and ion nitration of steel parts surfaces. Method of thermally treated steel part surface hardening comprises stage of spark-erosion alloying and ion nitriding operation, wherein ion nitriding operation is carried out before or after spark-erosion alloying during time, sufficient for part surface layer saturation with nitrogen at depth of thermal influence zone to prevent hardness reducing in it. Operation of spark-erosion alloying is performed by graphite electrode at least in two stages with reduction of discharge energy at each subsequent stage. First stage of alloying with graphite electrode is performed with discharge power of 0.1-6.4 J and output of 0.2-4.0 cm²/min, and second stage of alloying with graphite electrode is performed with discharge power of 0.1-2.83 J and output of 0.2-2.0 cm²/min.

EFFECT: enabling higher efficiency without increase in roughness.

1 cl, 3 dwg, 3 tbl