Machining Performance of Inconel 718 Under Dry, MQL, and Nanofluid MQL Conditions: Application of Coconut Oil (Base Flui
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RESEARCH ARTICLE-MECHANICAL ENGINEERING
Machining Performance of Inconel 718 Under Dry, MQL, and Nanofluid MQL Conditions: Application of Coconut Oil (Base Fluid) and Multi-walled Carbon Nanotubes as Additives Subham Sarkar1 · Saurav Datta1 Received: 15 July 2020 / Accepted: 20 October 2020 © King Fahd University of Petroleum & Minerals 2020
Abstract 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. Keywords Superalloy · Inconel 718 · Minimum quantity lubrication (MQL) · Nanofluid MQL (NFMQL) · Multi-walled carbon nanotubes (MWCNTs) · Tool wear
1 Research Background Superalloy (also called high-performance alloy) is the family of alloys which shows excellent high-temperature strength, high corrosion and oxidation resistance, good surface stability, and outstanding resistance toward thermal creep deformation. Inconel 718 is a nickel-based superalloy which consists of a high amount of nickel, chromium, and iron; and a considerable amount of niobium and molybdenum. The presence of niobium age-hardens the alloy, and thus, provides high strength as well as high fatigue resistance. Inconel 718 belongs to the family of heat-resistant superalloy (HRSA); it shows excellent thermal resistance and can retain mechanical properties at elevated temperatures, generally above 700 °C.
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Saurav Datta [email protected] Department of Mechanical Engineering, National Institute of Technology, Rourkela, Odisha 769008, India
These properties make the alloy suitable for diverse applications including turbine engines, cryogenic tankages, various parts of aircrafts, and liquid rockets [1]. Inconel 718 also exhibits excellent welding characteristics such as resistance towar
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