Cutting performance of coated tools with various adhesion strength quantified by inclined impact tests

Bouzakis, K.-D.; Michailidis, Nikolaos; Bouzakis, E.; Katirtzoglou, G.; Makrimallakis, S.; Gerardis, S.; Παππά, Μαρία; Klocke, Fritz; Schalaster, R.; Gorgels, Christof

doi:10.1016/j.cirp.2011.03.076

Cited by 10 publications

(1 citation statement)

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“…Some studies emphasize the importance of microstructure in mono and dual phase Ti-Al-N coatings to their response to mechanical load [15,16]. To understand the effect of any compositional difference on wear resistance, cyclic impact testing has been shown to be a valuable tool [17][18][19][20][21]. In this work, we will focus on the wear behavior of AlTiN arc PVD coatings with borderline Al contents and different shares of cubic and hexagonal phase.…”

Section: Introductionmentioning

confidence: 99%

Effect of Hexagonal Phase Content on Wear Behaviour of AlTiN Arc PVD Coatings

Kohlscheen

Bareiss

2018

Coatings

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In this study, the effect of increasing aluminum content and magnetic steering field strength on the structure and wear behavior of arc PVD AlTiN coatings is discussed. Deposition was done by means of an industrial-scale PVD unit for tool coating. The aluminium content in the AlTi source material was increased from 67 to 73 at.%. We applied two settings of the magnetic field that steers the arc across the cathode surface thereby evaporating the AlTi alloy differently. The resulting coating thickness ranged from 3.5 to about 7 µm. Cemented tungsten carbide was used as substrate material. Coating properties like hardness, adhesion, and crystal phases were analyzed by indentation and X-ray diffraction, respectively. The wear behaviour of the different AlTiN hard coatings were investigated in two ways. In a first idealized test, cyclic impacting was done applying a constant force. The resulting wear pattern was quantified by an Alicona multi-focus microscope. A second wear test was done by metal cutting under realistic conditions. Fly milling of ductile cast iron (EN-GJS-700) was performed with regular interruptions in order to measure the increasing wear mark. As expected, aluminium contents above 67 at.% (in the metal fraction of the coating) lead to a decreased wear resistance as the soft hexagonal phase exceeds values of a few vol.%. However, it was found that the formation of the hexagonal phase can be effectively influenced and delayed by increasing the magnetic steering field at the cathode. The wear behavior observed in cyclic impact testing corresponds well to results obtained with the more complex loading situation encountered in milling.

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