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Influence of pre-heat treatment on wear resistance of 40Kh13 steel modified with nitrogen ions

The mechanism of wear of 40Kh13 steel modified with nitrogen ions, subjected to preliminary heat treatment in various modes, has been investigated. It is shown that the phase composition of the nitrided layer includes chromium nitride CrN and a matrix phase α-Fe. It was found that in the process of friction of the nitrogen-modified steel 40Kh13, accelerated wear of the nitrided layer is recorded with a decrease in its thickness to a certain critical value. It is shown that with an increase in substrate hardness, the critical thickness of the nitrided layer decreases from 11...12 μm to 9...10 μm.