The Effect of the Creep-Feed Grinding Speed on the Morphology and Chemical Composition of the Titanium Alloy Surface

This article examines the features of relief formation and chemical composition of a titanium alloy surface machined using creep-feed grinding by a highly porous silicon carbide wheel at various operating speeds. The quality of the machined surface is investigated using a Versa 3D electron microscope. A mechanism of formation of the adhered metal on the ground surface that results from the adhesive-cohesive interaction between the machined material and the abrasive instrument is proposed. Metal adherence occurs mainly at the stage of the constant contact arc length. The morphology of the treated surface at the exit stage is nearing that of the surface morphology formed by pendular grinding. The density of the adhered metal being transferred onto the machined surface increases with an increase of the grinding speed. The thickness of the adhered metal on the titanium alloy surface is determined. The surface roughness is investigated at various cross-sections along the entire length of the workpiece. The differences in surface roughness along the entire surface length, the constant contact arc length and the exit stage are shown. The influence of the grinding speed on the surface roughness is investigated. The presence of silicon carbide crystals on the machined surface is confirmed by the results of a local X-ray spectral microanalysis. The average concentration of silicon becomes higher with the increase of the grinding speed.

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