The Condition of Machined Surface of Titanium Alloy in Dry Grinding

The Versa 3D twin-beam electron microscope was used to study the relief and chemical composition of the VT3-1 titanium alloy surface after grinding with the ceramic bonded silicon-carbide wheel without grinding fluid. The results show that the process of infeed grinding of titanium alloy is associated with adhesive and cohesive processes which lead to the formation of a multi-layer structure of the machined surface. The thickness of the multi-layer structure without adhered material amounts to 2-4 mu m. The X-ray spectral microanalysis elicited the modification of the chemical composition. The experimental result indicated that the mass concentration of oxygen, nitrogen, and carbon atoms increases by more than 20 times. The concentration of carbon, nitrogen and silicon becomes lower as the analyzed layer thickness increases. (C) 2017 The Authors. Published by Elsevier Ltd.