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Open AccessArticle

The Tool Life and Coating-Substrate Adhesion of AlCrSiN-Coated Carbide Cutting Tools Prepared by LARC with Respect to the Edge Preparation and Surface Finishing

1
Faculty of Materials Science and Technology in Trnava, Institute of Production Technologies, Slovak University of Technology in Bratislava, Jána Bottu 25, 917 24 Trnava, Slovakia
2
Faculty of Materials Science and Technology in Trnava, Institute of Material Science, Slovak University of Technology in Bratislava, Jána Bottu 25, 917 24 Trnava, Slovakia
3
Faculty of Mechanical Engineering, Department of Machining, Assembly and Engineering Metrology, Technical Univesity of Ostrava, 17. listopadu 15, 708 33 Ostrava—Poruba, Czech Republic
4
Faculty of Mechanical Engineering, Department of Machining Technology, Technická 2, Brno University of Technology, Královo Pole, 61669 Brno, Czech Republic
*
Author to whom correspondence should be addressed.
Micromachines 2020, 11(2), 166; https://doi.org/10.3390/mi11020166
Received: 30 December 2019 / Revised: 30 January 2020 / Accepted: 3 February 2020 / Published: 5 February 2020
(This article belongs to the Special Issue Selected papers from the ICNNN 2019 and ICAFM 2019)
Nanocomposite AlCrSiN hard coatings were deposited on the cemented carbide substrates with a negative substrate bias voltage within the range of −80 to −120 V using the cathodic arc evaporation system. The effect of variation in the bias voltage on the coating-substrate adhesion and nanohardness was investigated. It was clear that if bias voltage increased, nanohardness increased in the range from −80 V to −120 V. The coating deposited at the bias voltage of −120 V had the highest nanohardness (37.7 ± 1.5 GPa). The samples were prepared by brushing and wet microblasting to finish a surface and prepare the required cutting edge radii for the tool life cutting tests and the coating adhesion observation. The indents after the static Mercedes indentation test were studied by scanning the electron microscope to evaluate the coating-substrate adhesion. The longer time of edge preparation with surface finishing led to a slight deterioration in the adhesion strength of the coating to the substrate. The tool wear of cemented carbide turning inserts was studied on the turning centre during the tool life cutting test. The tested workpiece material was austenitic stainless steel. The cemented carbide turning inserts with larger cutting edge radius were worn out faster during the machining. Meanwhile, the tool life increased when the cutting edge radius was smaller.
Keywords: tool life; tool wear; edge preparation; cutting edge radius; surface finish; nanocomposite hard coating; coating-substrate adhesion; brushing; wet microblasting tool life; tool wear; edge preparation; cutting edge radius; surface finish; nanocomposite hard coating; coating-substrate adhesion; brushing; wet microblasting
MDPI and ACS Style

Vopát, T.; Sahul, M.; Haršáni, M.; Vortel, O.; Zlámal, T. The Tool Life and Coating-Substrate Adhesion of AlCrSiN-Coated Carbide Cutting Tools Prepared by LARC with Respect to the Edge Preparation and Surface Finishing. Micromachines 2020, 11, 166.

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