Abstract
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.
Highlights
The coating-substrate adhesion strength, the hardness of coated cutting tools, and the cleaning of the substrate before deposition are critical factors for producing cutting tools with excellent performence [1].Xiao et al investigated the adhesion strength and failure mechanism of the hard CrN coatings deposited on different substrates [2]
The cleaning process of substrates and further plasma pre-treatment of the substrate surfaces are necessary for achieving excellent coating-substrate adhesion [3]
The coating-substrate adhesion is affected by the deposition parameters and the coating thickness [8]
Summary
The coating-substrate adhesion strength, the hardness of coated cutting tools, and the cleaning of the substrate before deposition are critical factors for producing cutting tools with excellent performence [1]. Xiao et al investigated the adhesion strength and failure mechanism of the hard CrN coatings deposited on different substrates [2]. It was necessary to introduce new parameters for an accurate description of the asymmetric cutting edge because the size of the cutting edge radius was not enough. The approaches of authors as Rodriguez [28] and Wyen et al [29] used different ways to characterize the shape and size of the asymmetric cutting edge microgeometry. The influence of coating deposition parameters and surface finishing methods on coating-substrate adhesion was determined. The effect of the cutting edge radius size on the tool life during turning of the austenitic stainless steel material was investigated
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