Wear resistance of a laser-clad NiCrBSi coating hardened by frictional finishing

Abstract

Frictional finishing of a laser clad NiCrBSi coating offers high-quality surfaces (Ra=60 nm) and higher microhardness, 855 HV0.025, on the coating surface (as compared to the hardness of coatings without frictional finishing, 570 HV0.025). It forms a mixed nano- and submicrocrystalline structure in a thin surface layer (5 to 7 µm). Under conditions of sliding friction without lubrication, frictional treatment changes the basic wear modes from adhesive seizure and plastic edging to predominantly elastic edging. This has caused elimination of the running-in period and a corresponding decrease in the wear intensity of a strain-hardened coating at the initial stage of friction.