Study on the Influence Study on the Influence of TiAlN and AlTiN coated Carbide Tools and Cutting Parameters for the dry machining of Inconel 718

초록

Inconel 718 is an aerospace superalloy that depicts excellent toughness, stability, high strength and corrosion resistance properties in extreme temperature and pressure environments. Presently, the machining of this superalloy without the use of cutting fluid poses a significant challenge in the manufacturing sector. The process of machining under dry condition is significantly more cost-effective and environmentally friendly. Tools with proper coating materials and the optimisation of the cutting parameters in dry milling of Inconel may increase the product efficiency and overall quality of the milling process. This paper aims to investigate the effect of TiAlN and AlTiN-coated carbides in the machining of Inconel 718. The Central Composite Design (CCD) under the Response Surface Methodology is used to in order to reduce number of experiments. The present work has determined the optimal range for the cutting parameters for coated carbide end mills. Results indicate that the tool coatings play a key role when machining Inconel without the use of cutting fluids. The experiments in the current work resulted in a minimum surface roughness of 0.210μm and 0.330μm using TiAlN and AlTiN tool coatings, respectively. These results are comparable with surface roughness values achieved in conventional wet machining. The models developed in the current work provide a framework for predicting surface roughness and optimising the results using a statistical approach. The feed rate and depth of cut have been found to be the most significant parameters affecting the surface roughness in dry milling. © 2026 Institute of Physics Publishing. All rights reserved.