Investigation of Cutting Temperature during Turning Inconel 718 with (Ti,Al)N PVD Coated Cemented Carbide Tools

Abstract

Physical Vapor Deposition (PVD) Ti1−xAlxN coated cemented carbide tools are commonly used to cut difficult-to-machine super alloy of Inconel 718. The Al concentration x of Ti1−xAlxN coating can affect the coating microstructure, mechanical and thermo-physical properties of Ti1−xAlxN coating, which affects the cutting temperature in the machining process. Cutting temperature has great influence on the tool life and the machined surface quality. In this study, the influences of PVD (Ti,Al)N coated cemented carbide tools on the cutting temperature were analyzed. Firstly, the microstructures of PVD Ti0.41Al0.59N and Ti0.55Al0.45N coatings were inspected. The increase of Al concentration x enhanced the crystallinity of PVD Ti1−xAlxN coatings without epitaxy growth of TiAlN crystals. Secondly, the mechanical and thermo-physical properties of PVD Ti0.41Al0.59N and Ti0.55Al0.45N coated tools were analyzed. The pinning effects of coating increased with the increasing of Al concentration x, which can decrease the friction coefficient between the PVD Ti1−xAlxN coated cemented carbide tools and the Inconel 718 material. The coating hardness and thermal conductivity of Ti1−xAlxN coatings increased with the increase of Al concentration x. Thirdly, the influences of PVD Ti1−xAlxN coated tools on the cutting temperature in turning Inconel 718 were analyzed by mathematical analysis modelling and Lagrange simulation methods. Compared with the uncoated tools, PVD Ti0.41Al0.59N coated tools decreased the heat generation as well as the tool temperature to reduce the thermal stress generated within the tools. Lastly, the influences of Ti1−xAlxN coatings on surface morphologies of the tool rake faces were analyzed. The conclusions can reveal the influences of PVD Ti1−xAlxN coatings on cutting temperature, which can provide guidance in the proper choice of Al concentration x for PVD Ti1−xAlxN coated tools in turning Inconel 718.

Coating-thickness-dependent physical properties and cutting temperature for cutting Inconel 718 with TiAlN coated tools

“…The cutting temperature was measured by forward-looking infrared (FLIR) thermal imaging camera to confirm the simulation results. Zhao et al [7] conducted the dry cutting of Inconel 718 with Ti 0.41 Al 0.59 N and Ti 0.55 Al 0.45 N coated tools (coating thickness of 2 μm). K-type thermocouples were embedded to record the internal temperatures of the tool bodies.…”

Modelling and prediction of cutting temperature in the machining of H13 hard steel of multi-layer coated cutting tools

“…Coating element content is affecting the cutting heat transfer. Zhao et al [11] studied the heat transfer performance of TiAlN coated tools through orthogonal cutting experiment and finite element simulation, analyzed the tool coating (Ti0.41 Al0.59 N, Ti0.55 Al0.45 N) and fed on the influence of temperature. Compared with Ti0.55 Al0.45 N coated tools, Ti0.41 Al0.59 N coated tools can reduce the generation of cutting heat and tool temperature.…”

Experimental research on micro-cutting wear of 38CrSi steel caused by TiAlN- and TiCrAlN-coated tools

“…8 Suzuki and Konno found that the grain bonding strength of electroplated diamond tools had been improved due to the application of Ni-carbon nanotube (CNT) coatings. 9 Zhao et al 10 declared that the Al concentration of Ti 1Àx Al x N coating affected the microstructure, mechanical and thermophysical properties of it, the hardness and thermal conductivity of coating increased with the increase of Al concentration. In addition, cutting performance could be improved by enhancing the adhesion between coatings and the tool substrate.…”