Abstract
The work was devoted to the study of the effectiveness of the application of multi-component coatings, TiN–Al/TiN, TiN–AlTiN/SiN, and CrTiN–AlTiN–AlTiCrN/SiN, obtained by cathodic arc deposition to increase the wear resistance of 6WH10F carbide end mills in trochoidal milling of titanium alloy. The surface morphology of the tool with coatings was studied using scanning electron microscopy, and surface roughness texture was estimated. Microhardness and elastic modulus of the coated carbide tool surface layer were determined by nanoindentation. The process of sticking titanium to the working surface of the tool and quantitative evaluation of end mill wear with multi-component coatings at the trochoidal strategy of milling titanium alloy was studied. The CrTiN–AlTiN–AlTiCrN/SiN coating showed the maximum value of the plasticity index at the level of 0.12. The maximum effect of reducing the wear rate was achieved when using a tool with a CrTiN –AlTiN–AlTiCrN/SiN coating when the operating time to failure of end mills was increased by 4.6 times compared to samples without coating, by 1.4 times compared with TiN–Al/TiN coating and 1.15 times compared with TiN–AlTiN/SiN coating.
Highlights
Titanium alloys have become indispensable structural materials in the aerospace and aviation industries due to the optimal ratio of strength properties, weight characteristics, excellent corrosion, and heat resistance over a wide temperature range
The high specific strength of titanium alloys leads to an increase in temperature in the cutting zone
It can be concluded that TiN–Al/TiN is not an optimal choice for working under these processing conditions, even considering that all the coatings studied made a significant contribution to increasing the tool wear resistance during the operational tests
Summary
Titanium alloys have become indispensable structural materials in the aerospace and aviation industries due to the optimal ratio of strength properties, weight characteristics, excellent corrosion, and heat resistance over a wide temperature range. Disks, vanes of engines and compressors are just some examples of widely used parts made of titanium-based alloys. Despite these undeniable advantages, titanium alloys have certain disadvantages, primarily poor machinability that encourages plenty of researchers to use various techniques to improve titanium alloy machining [1,2,3]. The high specific strength of titanium alloys leads to an increase in temperature in the cutting zone. Titanium is chemically active, which causes the activation of adhesive processes, welding, and sticking of chips to the tool. The tool wears out intensively with this combination of power and thermal loads, and often cutting-edge chipping is observed during milling [4,5,6,7]
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