Wear Resistance of Experimental Hard Alloys Grades with Co-Mo-Ti Binders upon Conditions of Friction without Lubricant on Stainless Steel

Abstract

The results of studies of wear resistance and tribological properties of experimental single carbide hard alloys grades with modified Co-Mo-Ti binders upon conditions of friction without lubricant on stainless steel are presented. All the data obtained were compared with similar parameters for the basic alloy VK8 (Co-Mo), on the basis of which the experimental grades were developed. Tribological tests were performed on tribometer which implemented a scheme of friction "pin on disk" at constant sliding speed and normal load values with artificially heated tribo contact zone. Studies have found that partial substitution of cobalt in a binder by Mo and Ti has led to a decrease in average friction rates. It was established that the greatest wear resistance and the best tribological characteristics were obtained for specimens of experimental grade 2.22 (5,65%Co+1,8%Mo+0,6%Ti). The process of friction for this pin material was characterized by the formation of secondary structures with high shielding properties, reducing of the adhesive interaction of materials, low volume wear intensity, minimal friction coefficient, as well as the least roughness of friction tracks on the counter body (disk). An increase in the proportion of molybdenum in the binder of more than 5% reduced the wear resistance of the experimental grades in comparison with the basic alloy VK8.

Tribological properties of high-entropy high-speed steels under conditions of friction on stainless steel 12H18N9T

“…Thus, the process of frictional interaction with structural steel 30HGSA for these materials in similar tests is also characterized by the fastest increase in the thickness of the intermediate layer and the smallest change in the micro relief both on the surface of the indenter and on the friction tracks on the disk [14]. The process of friction of high-entropy experimental hard alloys on various structural materials proceeds according to a similar scenario [16,17]. The formation of a stable intermediate layer for this group of materials is facilitated, in particular, by their surface mechanical characteristics at the microlevel, i.e., higher values of microhardness and modulus of elasticity [13][14][15][16][17].…”

“…The process of friction of high-entropy experimental hard alloys on various structural materials proceeds according to a similar scenario [16,17]. The formation of a stable intermediate layer for this group of materials is facilitated, in particular, by their surface mechanical characteristics at the microlevel, i.e., higher values of microhardness and modulus of elasticity [13][14][15][16][17].…”