Machining of different superalloys under MQL using hBN nanofluids

ABSTRACT

Nickel based alloys are found in industrial sectors of aerospace and gas turbines. The present study focused on the hBN nanofluid's impact on six different superalloys machinability aspects with TiAlN coated carbide tool. Further, the input-parameters optimization is through the CRITIC-WASPAS methodology. The experiments are performed by considering the workpiece, nanofluid weight concentration, speed, and feed rate based on an L18 mixed-level orthogonal design. The nickel-based samples are Nimonic 75, Inconel X-750, Nimonic C-263, Nimonic 90, Hastelloy X, and Inconel 625. The impact of nanofluids on various superalloys on the force, roughness, and residual stress are measured and analyzed. The results show that the lowest cutting force is for Inconel 625, the highest surface finish for Inconel X-750, and the lowest tensile residual stress for Nimonic 75 at the determined optimal levels of 1.00% wt. of hBN, 70m/min, and 0.14mm/rev. The highest tensile residual stress is found for Inconel 625 (779MPa) and the lowest for Nimonic 75 (673MPa). The highest roughness value is 1.294µm for Inconel X-750, while the lowest is 0.752µm and 0.780µm for both Inconel 625 and Nimonic 90. The highest cutting force of 368N is experienced for Nimonic C-263 and the least of 217N for Inconel 625. 

KEYWORDS:

• Machinability
• nanoparticle
• nanofluids
• superalloys
• residual stress
• roughness
• force
• optimisation

Disclosure statement

No potential conflict of interest was reported by the author(s).