Wear Behavior of TiAlVN-Coated Tools in Milling Operations of INCONEL® 718

Abstract

The use of coatings on cutting tools offers several advantages from the point of view of wear resistance. A recent technique with great coating deposition potential is PVD HiPIMS. TiAlN-based coatings have good resistance to oxidation due to the oxide layer that is formed on their surface. However, by adding doping elements such as Vanadium, it is expected that the wear resistance will be improved, as well as its adhesion to the substrate surface. INCONEL® 718 is a nickel superalloy with superior mechanical properties, which makes it a difficult-to-machine material. Milling, due to its flexibility, is the most suitable technique for machining this alloy. Based on this, in this work, the influence of milling parameters, such as cutting speed (Vc), feed per tooth (fz), and cutting length (Lcut), on the surface integrity and wear resistance of TiAlVN-coated tools in the milling of INCONEL® 718 was evaluated. The cutting length has a great influence on the process, with the main wear mechanisms being material adhesion, abrasion, and coating delamination. Furthermore, it was noted that delamination occurred due to low adhesion of the film to the substrate, as well as low resistance to crack propagation. It was also observed that using a higher cutting speed resulted in increased wear. Moreover, in general, by increasing the milling parameters, machined surface roughness also increased.

A Comparative Study of Different Milling Strategies on Productivity, Tool Wear, Surface Roughness, and Vibration

“…Figure 7c shows the EDS analysis, which shows that the chemical composition of the tool surface in sample areas Z1 and Z2 is mainly composed of the W element, and in sample area Z3, the Al element can be observed from the milled surface. Regarding the good performance of the coating, recent work carried out by the same group [44][45][46] has identified problems with the adhesion of some coatings (TiAlTaN, TiAlYN and TiAlTaN, TiAlYN) deposited using industrial machines on the same substrate, but machining other materials (Inconel and AMPCO alloy), a situation that was not observed in the case of these tools working according to this cutting strategy and machining an aeronautical aluminum alloy (AA7075-T7451). Thus, these coatings demonstrate good adhesion properties to the substrate and prove to be efficient in terms of hindering the adhesion of the machined material to the tool surface.…”

A Comparative Study of Machining Property in Inconel 718 Superalloy Grinding with Al2O3- and CBN/Fe-Based Spherical Magnetic Abrasives

“…Due to the high hardness, strength, viscosity, and toughness of the Inconel 718 superalloy, it is difficult to meet the required quality requirements using traditional grinding techniques [1][2][3]. Therefore, magnetic abrasive finishing (MAF) technology is used to attempt to improve its surface quality [4][5][6][7].…”