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primary topic: Machinability study of hardened steel under cryo-lubrication using coated tools in high-speed turning process

Machinability study of hardened steel under cryo-lubrication using coated tools in high-speed turning process
type: AcademicArticle
type: Article
abstract: Hard turning is increasingly recognized as a sustainable alternative to conventional grinding for finishing hardened steel components. However, high thermo-mechanical loads generated during dry turning can leads to accelerated tool wear and surface integrity issues. To address these limitations, sustainable practices such as cryogenic cooling (LN2) and minimum quantity lubrication (MQL) have been explored. Although both techniques have demonstrated promising results independently, their combined use as cryo-lubrication strategy remains an emerging research area, especially for hard turning using coated carbide tools. In this context, this study investigates the machinability of hardened AISI 4340 steel under cryo-lubrication (LN2+MQL). Machining parameters including cutting speed (V)â��=â��300â��350â� m/min, feed rate (f)â��=â��0.05â��0.1â� mm/rev, and depth of cut (doc)â��=â��0.1â��0.2â� mm were arranged as per Taguchi L4orthogonal array to evaluate machinability based on cutting force, tool life, wear mechanisms and chip morphology. Results showed that depth of cut had the highest influence on cutting force and tool life. The optimal setting Vâ��=â��300â� m/min, fâ��=â��0.05â� mm/rev, docâ��=â��0.1 yielded the lowest cutting force (90.81N) and longest tool life(54.8â� min). While, highest combination of feed rate and depth of cut resulted in highest cutting force (195.50N) and shortest tool life (12.7â� min). SEM and EDS analysis identified significant abrasion, noticeable coating delamination, and adhesion as the main wear mechanisms. Furthermore, chip morphological analysis revealed closely spaced saw-tooth segments at lower speeds and highly serrated free ends at higher speeds. This research highlights the potential of cryo-lubrication as an effective machining technique for enhancing the performance of hard turning process using carbide tools. © IMechE 2025
date: 2025
is part of: Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
status: peerReviewed
status: published
author list: authors
type: EPrint
type: ArticleEPrint
is part of: repository

SAGE Publications Ltd
type: Organization

Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
type: Collection
issn: 13506501

Tee Kai Ling
type: Person
given name: Tee Kai
family name: Ling

Nabil Jouini
type: Person
given name: Nabil
family name: Jouini

Shalina Sheik Muhamad
type: Person
given name: Shalina
family name: Sheik Muhamad

Afifah Z Juri
type: Person
given name: Afifah Z
family name: Juri

Che Hassan Che Haron
type: Person
given name: Che Hassan
family name: Che Haron

Saima Yaqoob
type: Person
given name: Saima
family name: Yaqoob

Jaharah A Ghani
type: Person
given name: Jaharah A
family name: Ghani

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primary topic: Machinability study of hardened steel under cryo-lubrication using coated tools in high-speed turning process