Dry Sliding Behavior of Additively Grown Alloys BrAMts9-2/12Kh18N9T

By means of additive electron beam growing BrAMts9-2/12Kh18N9T alloys with the following con-centration ratios of 90:10, 75:25, 50:50 and 25:75 were obtained. In the work the microstructure, mechan-ical and tribological properties of the obtained materials were investigated. Balls of Si3N4 were used as counterbodies, which slid without lubrication on disks of the obtained materials. The maximum and mini-mum levels of tensile strength were 813 MPa and 635 MPa, achieved for samples containing BrAMts9-2/12Kh18N9T in the ratio of 50:50 and 75:25, respectively. It is shown that with an increase in the steel content from 10 to 75 %, there is an increase in the average friction coefficient and wear intensity. There is a change in the wear mechanism from wear due to excessive plastic deformation to abrasive wear. This transition is accompanied by a decrease in the fluctuations of the friction coefficient values. Despite the presence of subsurface defects in alloys with a large amount of steel, their average friction coefficient values are in the range of smaller values (0.38—0.42) compared to materials known from the literature, the friction coefficient of which is in the range of 0.46—0.52 under comparable tribological test conditions. Thus, the materials obtained in the work have high properties that allow these materials to be used in the manufacture of highly loaded parts and units of shipping equipment subject to wear under aggressive en-vironments.

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