Performance evaluation of uncoated and CrAlSiN nanocomposite coated tungsten carbide tools in conventional and Laser-assisted turning of inconel-625

Abstract

The expansion in nuclear, aerospace, and automotive sectors surged the demand for high-temperature materials like Inconel-625. These materials are difficult-to-machine due to their high strength, low thermal diffusivity, and work-hardening properties. The surface finish, dimensional accuracy, and material removal rates achieved in traditional machining processes are marginal and require frequent tool changes due to high tool-wear, resulting in low productivity and elevated machining costs. Thus, there is a need for new and alternative hybrid manufacturing processes to be developed for machining hard-to-cut materials, which are highly efficient, eco-friendly, and sustainable. Laser-assisted machining, which emerged as a new and advanced hybrid thermal-assisted machining technology, has proven to enhance the machinability of difficult-to-cut materials over the decades. The present study investigates the tool-life of CrAlSiN nanocomposite-coated and uncoated tungsten carbide tools in conventional and laser-assisted turning of Inconel-625 according to ISO-3685 standard. The results showed a 40% and 160% increase in tool-life for uncoated tools and CrAlSiN-coated tools, respectively, in laser-assisted turning compared to conventional turning of Inconel-625 in similar conditions.