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Coatings 2018, 8(1), 44; https://doi.org/10.3390/coatings8010044

Influence of Thickness of Multilayered Nano-Structured Coatings Ti-TiN-(TiCrAl)N and Zr-ZrN-(ZrCrNbAl)N on Tool Life of Metal Cutting Tools at Various Cutting Speeds

1
Department of Mechanical Engineering, Moscow State Technological University STANKIN, Moscow 127055, Russia
2
University Administration, Moscow State Technological University STANKIN, Moscow 127055, Russia
3
Department of Solid State Physics and Nanosystems, National Research Nuclear University MEPhI, Moscow 115409, Russia
4
Material Properties Research Laboratory, Moscow State Technological University STANKIN, Moscow 127055, Russia
5
Material Cutting Technology Laboratory, Moscow State Technological University STANKIN, Moscow 127055, Russia
6
Department of Composite Materials, Moscow State Technological University STANKIN, Moscow 127055, Russia
*
Author to whom correspondence should be addressed.
Received: 24 December 2017 / Revised: 14 January 2018 / Accepted: 16 January 2018 / Published: 23 January 2018
(This article belongs to the Special Issue Manufacturing and Surface Engineering)
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Abstract

This paper considers the influence of thickness of multilayered nano-structured coatings Ti-TiN-(TiCrAl)N and Zr-ZrN-(ZrCrNbAl)N on tool life of metal cutting tools at various cutting speeds (vc = 250, 300, 350 and 400 m·min−1). The paper investigates the basic mechanical parameters of coatings and the mechanism of coating failure in scratch testing depending on thickness of coating. Cutting tests were conducted in longitudinal turning of steel C45 with tools with the coatings under study of various thicknesses (3, 5, and 7 µm), with an uncoated tool and with a tool with a “reference” coating of TiAlN. The relationship of “cutting speed vc—tool life T” was built and investigated; and the mechanisms were found to determine the selection of the optimum coating thickness at various cutting speeds. Advantages of cutting tools with these coatings are especially obvious at high cutting speeds (in particular, vc = 400 m·min−1). If at lower cutting speeds, the longest tool life is shown by tools with thicker coatings (of about 7 μm), then with an increase in cutting speed (especially at vc = 400 m·min−1) the longest tool life is shown by tools with thinner coating (of about 3 μm). View Full-Text
Keywords: multilayered nano-structured coatings; tool life; metal cutting tools; scratch testing multilayered nano-structured coatings; tool life; metal cutting tools; scratch testing
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Vereschaka, A.; Kataeva, E.; Sitnikov, N.; Aksenenko, A.; Oganyan, G.; Sotova, C. Influence of Thickness of Multilayered Nano-Structured Coatings Ti-TiN-(TiCrAl)N and Zr-ZrN-(ZrCrNbAl)N on Tool Life of Metal Cutting Tools at Various Cutting Speeds. Coatings 2018, 8, 44.

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