Surface roughness analysis in turning titanium alloy under MQL and cryogenic coolants

Sulaiman, Mohd Amri and Salleh, Mohd Shukor and Muhamad Khairussaleh, Nor Khairusshima and Ibrahim, Ikhwan Nasir and Tomadi, Siti Haryani and Rizal, Muhammad (2026) Surface roughness analysis in turning titanium alloy under MQL and cryogenic coolants. Jurnal Tribologi, 49 (NA). pp. 83-94. E-ISSN 2289-7232

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Abstract

Titanium alloys are valued for their high strength-to-weight ratio and thermal stability, making them essential in aerospace and medical applications. However, their poor thermal conductivity and rapid tool wear pose significant challenges to machinability. This study investigates the effects of minimum quantity lubrication (MQL) and cryogenic CO₂ cooling on surface roughness during the turning of titanium alloy (Ti-6Al-4V ELI). Turning operational were conducted on a CNC lathe using uncoated carbide inserts. The cutting parameters were set as follows: cutting speeds of 120, 170, and 220 m/min; feed rates of 0.10, 0.15, and 0.20 mm/rev; and depths of cut of 0.4, 0.5, and 0.6 mm. Surface roughness was measured with a portable Mitutoyo SJ-301 tester over a 20 mm cutting length at three different locations along the machined surface. Response surface methodology (RSM) was applied to analyze the data, assess model accuracy, and identify significant factors. Results showed that MQL consistently produced better surface quality, with feed rate identified as the most influential factor; lower feed rates yielded smoother finishes. These findings emphasize the role of advanced cooling techniques in enhancing machining performance, particularly for aerospace and biomedical applications where high precision is critical.

Item Type:	Article (Journal)
Uncontrolled Keywords:	Ti-6Al-4V ELI, Turning process, MQL, Cryogenic, Surface roughness
Subjects:	T Technology > T Technology (General) > T175 Industrial research. Research and development
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering Kulliyyah of Engineering > Department of Manufacturing and Materials Engineering
Depositing User:	Dr Siti Haryani Tomadi
Date Deposited:	13 Oct 2026 12:14
Last Update:	13 Oct 2026 12:14
Queue Number:	2026-10-Q5555
URI:	http://irep.iium.edu.my/id/eprint/131494
Indexed In:	WOS and SCOPUS, Google Scholar, MyCite

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