Self-lubricating CrAlVN coatings for turning of Ti6Al4V: oxidation and wear behavior

The titanium alloy Ti6Al4V enables significant performance increases in various branches of industry. Nevertheless, it is difficult to machine, because of its material properties. Due to the low thermal conductivity of titanium, the heat generated while turning Ti6Al4V mainly flows into the tool leading to high temperature loads. In addition, the comparatively low Young’s modulus and high yield strength contributes to high mechanical stresses during machining. Temperatureactive, self-lubricating physical vapor deposition hard coatings appear to be suitable for reducing friction and tool wear during turning of Ti6Al4V compared to the most commonly used uncoated carbide tools. The ability of the coating to form lubricating oxide phases at high temperatures is crucial for this purpose. This paper investigates the oxidation and diffusion behavior of vanadium doped chromiumaluminium nitride (CrAlN) coatings after heat treatment at ϑ=600°C, ϑ=700°C and ϑ=800°C in atmosphere as well as the resulting coating properties. The wear behavior of certain coating variants while turning of Ti6Al4V is analyzed.

DDC Class

600: Technik

Funding Organisations

Deutsche Forschungsgemeinschaft (DFG)

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The author gratefully acknowledge the financial support of the German Research Foundation, Deutsche Forschungsgemeinschaft (DFG) within the research project BO 1979/69-1/HI 843/10-1. Open access funding enabled and organized by Projekt DEAL.

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https://creativecommons.org/licenses/by-nc-nd/4.0/

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Materialwissenschaft Werkst - 2021 - Bobzin - Self%u2010lubricating CrAlVN coatings for turning of Ti6Al4V oxidation and wear.pdf

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20.7 MB

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Self-lubricating CrAlVN coatings for turning of Ti6Al4V: oxidation and wear behavior