Abstract
Chromium tungsten nitride (CrWN) thin films were deposited onto tungsten carbide tools substrates, by direct current (DC) reactive magnetron co-sputter at room temperature. The targets were metallic Cr and W, argon was the plasma gas and nitrogen was the reactive gas. A preliminary experiment to determine the optimal turning process parameters indicated spindle speed, feed rate, and cut depth clearly affect cutting performance. The use of a grey-based Taguchi method to determine the processing parameters of CrWN thin film deposition has been studied by considering multiple performance characteristics. Dry turning of AISI 304 stainless steel tests was carried out with these coated tools. The effect and optimization of CrWN thin film deposition parameters (DC reactive magnetron co-sputter parameters: Cr power, W power, N2/(Ar+N2) flow-rate ratios and deposition time) on the structure, roundness and flank wear in the turning operations were studied. In the confirmation runs, when using grey relational analysis, improvement of 12.64% was obtained in surface roughness, 9.09% in roundness and 25.52% in flank wear, respectively.
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