IJE TRANSACTIONS B: Applications Vol. 36, No. 02, (February 2023) 191-198 Please cite this article as: S. R. Nipanikar, G. D. Sonawane, V. G. Sargade, Tool Life of Uncoated and Coated Inserts during Turning of Ti6Al4V- ELI under Dry and Minimum Quantity Lubrication Environments, International Journal of Engineering, Transactions B: Applications, Vol. 36, No. 02, (2023), 191-198 International Journal of Engineering Journal Homepage: www.ije.ir Tool Life of Uncoated and Coated Inserts during Turning of Ti6Al4V-ELI under Dry and Minimum Quantity Lubrication Environments S. R. Nipanikar* a , G. D. Sonawane b , V. G. Sargade c a Babasaheb Ambedkar Technological University, Lonere, Maharashtra, India & Department of Mechanical Engineering, Karmaveer Bhaurao Patil College of Engineering, Satara, Maharashtra, India b Babasaheb Ambedkar Technological University, Lonere, Maharashtra, India & Sandip Foundation’s SITRC, Nashik, India PAPER INFO Paper history: Received 28 January 2022 Received in revised form 27 February 2022 Accepted 01 November 2022 Keywords: Ti6Al4V-ELI Uncoated Insert PVD AlTiN PVD TiAlN Dry Minimum Quantity Lubrication Tool Life ABSTRACT This paper mainly deals with the tool wear characteristics of uncoated cemented carbide insert and PVD AlTiN, PVD TiAlN coated carbide inserts during turning of Ti6Al4V-ELI (Extra Low Interstitial). To satisfy the sustainability conditions, the experiments have been conducted under dry and minimum quantity lubrication (MQL) environment. To enhance the effectiveness of MQL, palm oil has been used as the cutting fluid. The same machining parameters are employed for all the cutting tool inserts in dry and MQL environments to understand the machining characteristics better. It was found that cutting speed greatly influences average flank wear. Tool life of PVD TiAlN coated tool is more in both MQL, and dry environments as compared to uncoated cemented carbide insert and PVD AlTiN coated insert. Using palm oil under the MQL environment has produced better results while turning by PVD TiAlN insert. The characteristics like good cooling and lubrication provided significantly less average flank wear during machining of Ti6Al4V-ELI under the MQLenvironment. doi: 10.5829/ije.2023.36.02b.01 NOMENCLATURE Vc Cutting Speed (m/min) f Feed (mm/rev) 1. INTRODUCTION 1 Titanium-based alloys are observed as the most significant materials in the aerospace and biomedical sectors. Titanium alloys cover around 30% of the material in an aerospace engine [1]. Due to this, it is also known as aerospace alloys. Titanium alloys are extensively used in steam turbine blades, superconductors, missiles, marine services, electronic gadgets, biomedical instruments, sports equipment due to their excellent strength and corrosion resistance properties. The high strength-to-weight ratio is one of the reasons for the popularity of these alloys among the numerous sectors. Titanium-based alloys possess high corrosion resistance, hot hardness, and wear resistance [2]. Even though many favourable properties of titanium *Corresponding Author Institutional Email: suresh.nipanikar@kbpcoes.edu.in (S. Nipanikar) alloys are still very difficult to machine due to their inherent properties such as high strength and hardness at elevated temperature, low thermal conductivity, low modulus of elasticity, self-induced chatter, work hardening behaviour, and chemical reactivity with various materials at elevated temperatures [3]. Various literature has commented on the poor machining behaviour of titanium alloys. In this concern, Ayed et al. [4] performed machining of titanium alloy Ti17 with uncoated tungsten carbide insert under diverse machining environments. Adhesion wear, abrasion wear, notch wear, and plastic deformation were found to be the main wear mechanism during the machining of Ti17. Bordin et al. [5] studied the tool wear of coated carbide insert observed by adhesive wear mechanism during machining of Ti6Al4V under dry and cryogenic c Mechanical Engineering Department, Babasaheb Ambedkar Technological University, Lonere (Maharashtra), India