The paper considers multilayer composite nano-structured modified Ti-TiCN-(Ti,Al)CN coatings for metal-cutting tools. The coatings under the study have identical elemental composition (Al 30 at.%, Ti 70 at.%) and thickness (5 μm), but differ in the thicknesses of the nanolayers. The mechanical characteristics of the coatings were studied, and the tool life tests were carried out for carbide tools with the above coatings for dry turning of steel C45 at v c = 300, 350, and 400 m/min. Microstructural studies (using SEM) of the nature of wear and failure of metal-cutting tools with the coatings under study were conducted. It was found that, with the same strength of adhesion bond to the substrate, a coating with thicker sub-nanolayers has a greater tendency toward interlayer and inter-sublayer delamination. A tool with a coating characterized by a lower thickness of sub-nanolayers showed the longest tool life at all cutting speeds.
The International Journal of Advanced Manufacturing Technology – Springer Journals
Published: Nov 25, 2017
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