Sintered copper-graphite-steel composites and AISI 1020 steel samples were subjected to dry sliding against AISI 1045 steel with passing electric current of contact density above 100 A/cm~2. It is shown that the surface layers of the materials undergo phase transformation at a specific power on contact spots below 1 MW/cm~2 and form a tribolayer. The thickness of the tribolayer on these materials increases to 25-50 μm depending on the primary structure, with increasing current density. Catastrophic wear occurs at specific power on contact spots higher than 1.5 MW/cm~2. The AISI 1020 steel forms a tribolayer with a relatively high strength.
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