Abstract
We studied the influence of the lubricant compositions “Grafitol” with ∼10% graphite (1), “Aerol” containing ∼17% MoS2 (2), “Limol” containing ∼60% MoS2 (3), “Limol” + 10% chlorine-paraffin (4), and “Limol” + 10% copper powder (5) on the wear rate and formation of the fine structure of surface friction layers of structural steels. We established a correlation between the tribological characteristics of steels and lubricants. The abrasive wear of 40KhFA steel was minimum if it was lubricated with “Limol” + 10% copper powder. In this case, its wear was smaller by a factor of 10, 2, 1.25, and 7.25 as compared with lubricant compositions 1–4, respectively. In the course of minimum wear of 40KhFA steel, in the surface friction layers, we observed the minimum values of second-kind distortions (Δa/a) and of the true size of domains of X-ray coherent scattering (D) as well as the minimum difference between the crystal lattice constants (a) of steel before and after friction.
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