Abstract
Implantation of nitrogen ions with simultaneous deposition of atoms of another element allows for additional modification of implanted steel properties compared with the typical nitrogen implantation. Chromium-free tool steel NW1 was used in the studies. Energy of implanted nitrogen ions was 60 and 100keV and the dose was changed in the range (1–10)×1017N+/cm2. Tribological tests consisting in measurement of friction coefficient value were made on the pin-on-disk stand with the load of 0.29, 0.49 and 0.78N for unimplanted, implanted with nitrogen and implanted with nitrogen with simultaneous chromium deposition, respectively. The influence of implantation on steel microhardness and abrasive wear was also studied. An improvement of tribological properties of implanted samples with simultaneous deposition of chromium for the implantation energy equal to 100keV was observed. Decrease in the friction coefficient value is possible for nitrogen ions energy in the range 60keV but for large doses (⩾1018N+/cm2) and with the large loading values during tribological tests. Nitrogen implantation with chromium deposition increases microhardness of the samples. Relative changes of microhardness depend on a dose and energy of implanted nitrogen ions. Microhardness increase reaching 140% was observed with the load of hardness tester penetrator for the samples implanted with the dose D⩾1.2×1017N+/cm2.
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