Title: Evaluation of the impact of ecofriendly lubrication techniques on the surface roughness during AISI 8640 steel turning

Authors: Gustavo Henrique Correia Leandro; André Alves de Resende

Addresses: Faculty of Engineering, Federal University of Catalão, Av. Dr. Lamartine Pinto de Avelar, 1120, Catalão, 75701-775, Goiás, Brazil ' Faculty of Engineering, Federal University of Catalão, Av. Dr. Lamartine Pinto de Avelar, 1120, Catalão, 75701-775, Goiás, Brazil

Abstract: This study investigated the use of eco-friendly cutting fluids on surface roughness during the turning process of AISI 8640 steel. The lubrication conditions of dry cutting, minimum quantity lubrication (MQL), and MQL combined with solid lubricant (MQL + SL) was compared. The experimental results revealed that both MQL techniques significantly enhance surface quality, with the MQL + SL configuration resulting in the best results. The statistical analyses confirmed the significance of the cutting speed effects, feed rate, and lubrication conditions on the roughness. Furthermore, the study emphasised the minimal variation in roughness with changes in cutting speed but find the adverse effects of higher feed rates on surface finish. The results indicated that the best lubrication condition was MQL + SL since it produced surfaces with the lowest surface roughness. The roughness values for the MQL + SL condition were approximately 40% better than those of the MQL system and 60% better than those of dry cutting.

Keywords: ecofriendly cutting fluids; surface roughness; tool life; minimum quantity lubrication; MQL.

DOI: 10.1504/IJMMM.2026.150481

International Journal of Machining and Machinability of Materials, 2026 Vol.28 No.1, pp.1 - 18

Received: 26 Nov 2024
Accepted: 28 Feb 2025
Published online: 15 Dec 2025 *

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