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Tribological Behaviour of PVD Coated Tool Steels in Hot Forming of Aluminium Alloys
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0002-6513-3504
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-3123-0303
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1454-1118
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2019 (English)In: CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, 2019Conference paper, Published paper (Refereed)
Abstract [en]

Aluminium alloys are commonly used as light-weight materials in the automotive industry. Thisnon-ferrous family of metal alloys offers high versatility of properties and designs. In order to reduceweight and improve safety, grades with high strength-to-weight ratio, such as the 6XXX and 7XXXalloy series, are increasingly implemented in vehicles. These alloys, however, exhibit low formabilityand experience considerable springback when formed at low temperatures, and thus have to beformed at elevated temperatures. Severe adhesion and galling are known to be critical tribologicalchallenges in hot forming of aluminium. During the forming operation, adhesion and transfer ofaluminium onto the die surface take place. This phenomenon has a detrimental effect on the surfaceproperties, geometrical tolerances of the formed parts and maintenance of the dies. The influence ofsurface engineering as well as lubricant composition on adhesion and galling has not been sufficientlyinvestigated. Diamond-like-Carbon and Chromium Nitride PVD coatings applied on the toolsteel have shown promising results for reducing aluminium transfer at high-temperatures, especiallyin the presence of a lubricant. However, the interaction between lubricants and PVD coatings duringhot forming of aluminium alloys is not yet fully understood. The present study thus aims at characterisingthe high temperature tribological behaviour of selected PVD coatings and a lubricant duringsliding against an aluminium alloy. The objectives are to select promising lubricant-coating combinationsfor the given application and to study their tribological response in a high-temperature reciprocatingfriction and wear tester. The tests were carried out at 300°C, under dry and lubricatedconditions, in order to study the friction and wear performance. Uncoated tool steel reference testswere performed under dry and lubricated conditions and lubricated tests using DLC, CrN, CrTiNand CrAlN coated tool steel were performed and compared to the reference results. The initial andworn surfaces were analysed with white light 3D optical interferometry, scanning electron microscopy(SEM) and energy dispersive spectroscopy (EDS) with a view to understand the wear mechanisms.

Place, publisher, year, edition, pages
2019.
Keywords [en]
high temperature tribology, aluminium, lubrication, PVD coatings, material transfer, adhesion
National Category
Mechanical Engineering
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-73799OAI: oai:DiVA.org:ltu-73799DiVA, id: diva2:1308152
Conference
CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019
Available from: 2019-04-30 Created: 2019-04-30 Last updated: 2019-08-13

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CiteExportLink to record
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