The present work intends to investigate the application potential of coconut oil, as cutting fluid, during metal machining of a nickel-based superalloy. In doing so, machining performance of difficult-to-cut aerospace superalloy Inconel 718 is studied under dry, minimum quantity lubrication (MQL), and nanofluid MQL (NFMQL) using uncoated WC–Co tool, operated at varied cutting speeds. MQL environment is created by supplying air-oil mist in which commercially available coconut oil is used as cutting fluid. On the other hand, nanofluid is prepared by dispersing a specific concentration of multi-walled carbon nanotubes within coconut oil. Machining performance as observed in MQL and NFMQL is compared to that of dry machining. The following machining performance indicators are considered herein: cutting force magnitude, tool-tip temperature, and width of flank wear progression. In addition, studies on dominant modes and mechanisms of cutting tool wear, chip morphology (macro/micro), and surface roughness of the machined work part are also carried out. In the purview of machined surface roughness, it is concluded that NFMQL performs better than dry machining and conventional MQL. Flank wear is witnessed more severe during dry machining than MQL/NFMQL. However, beyond 83 m/min cutting speed, conventional MQL outperforms NFMQL (with 0.2 wt% nano-additives concentration) machining, from the viewpoint of flank wear width.

本工作旨在研究在镍基高温合金的金属加工过程中，椰子油作为切削液的应用潜力。在这样做时，加工性能难以-到-切航天超合金因康镍合金718被下干燥了研究，最小量润滑（MQL）和使用未涂覆的WC-Co工具的纳米流体MQL（NFMQL），以变化的切割速度操作。通过供应空气-油雾来创建MQL环境其中使用市售椰子油作为切削液。另一方面，通过将特定浓度的多壁碳纳米管分散在椰子油中来制备纳米流体。将MQL和NFMQL中观察到的加工性能与干加工进行了比较。本文考虑以下加工性能指标：切削力大小，刀尖温度和侧面磨损进程的宽度。此外，还研究了切削刀具磨损，切屑形态（宏观/微观）和加工零件的表面粗糙度的主要模式和机理。在加工表面粗糙度的范围内，可以得出结论，NFMQL的性能优于干式加工和传统的MQL。在干式加工中，侧面磨损比MQL / NFMQL更严重。然而，