Title: Multi-criteria decision making approach for selecting the best Ti alloy turning parameters by analysing the influence of cutting force on surface finish under different conditions

Authors: K. Srinivasulu; G. Krishna Mohana Rao

Addresses: Department of Mechanical Engineering, University College of Engineering Kakinada, JNTU Kakinada, Andhra Pradesh 533003, India ' Department of Mechanical Engineering, College of Engineering Science and Technology, JNTUH University, Hyderabad 500085, India

Abstract: Ti-alloys are known for their supreme physical properties and high industrial applications. The surface finish of the Ti-alloy is compromised when the high material removal rate desired. Hence, computing the best turning parameter of Ti-alloy is a multi-criteria decision making (MCDM) problem. Therefore, a risk minimisation based MCDM model is developed to determine the best turning parameter of Ti-alloy. The weight of the criteria is determined by the entropy method. The proposed model determined that the machining speed (MS) of 52 mm/min, feed 0.245 mm/rev, depth of cut (DOC) is 0.6 mm with synthetic oil as lubricant is the best for turning Ti-alloy by uncoated carbide tool. Whereas, MC of 96 mm/min, feed 0.29 mm/rev, DOC 0.6 mm with synthetic oil as lubricant used best for turning Ti-alloy by chemical and physical vapour deposited carbide tool. Finally, a sensitivity analysis is conducted to test the stability of the model.

Keywords: Ti-alloy; surface finish; multi-criteria decision making; MCDM; cutting forces; surface roughness; sensitivity analysis.

DOI: 10.1504/IJMMM.2026.150479

International Journal of Machining and Machinability of Materials, 2026 Vol.28 No.1, pp.68 - 89

Received: 22 Jan 2025
Accepted: 30 Mar 2025
Published online: 15 Dec 2025 *

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