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Investigation of material transfer in sliding friction-topography or surface chemistry?
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Dalarna Univ, Mat Sci, S-79188 Falun, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2016 (English)In: Tribology International, ISSN 0301-679X, E-ISSN 1879-2464, Vol. 100, p. 213-223Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

To differentiate between the roles of surface topography and chemical composition on influencing friction and transfer in sliding contact, a series of tests were performed in situ in an SEM. The initial sliding during metal forming was investigated, using an aluminum tip representing the work material, put into sliding contact with a polished flat tool material. Both DLC-coated and uncoated tool steel was used. By varying the final polishing step of the tool material, different surface topographies were obtained. The study demonstrates the strong influence from nano topography of an unpolished DLC coated surface on both coefficient of friction and material transfer. The influence of tool surface chemistry is also discussed.

Place, publisher, year, edition, pages
2016. Vol. 100, p. 213-223
Keyword [en]
Sliding, Topography, Coating, Transfer
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-300443DOI: 10.1016/j.triboint.2016.01.022ISI: 000379279600025OAI: oai:DiVA.org:uu-300443DiVA, id: diva2:951527
Funder
Swedish Research Council, 621-2013-5858
Available from: 2016-08-09 Created: 2016-08-09 Last updated: 2018-03-21Bibliographically approved
In thesis
1. Fundamental friction phenomena and applied studies on tribological surfaces
Open this publication in new window or tab >>Fundamental friction phenomena and applied studies on tribological surfaces
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis is based on two different projects, one more focused on applied research and one on more basic research. The first project examines the po- tential of nitriding as an alternative to case hardening in tribologically loaded components while the second project involves micro scale studies of the relations between roughness, transfer and friction between metals.

The first project consists of an evaluation of the tribological properties of nitrided steels. The aim is to increase the understanding of the wear and fric- tion behavior of different nitrided steels in relation to the choice of steel grade, microstructure, thickness and composition of the compound layer, among other parameters. This study is a part of a bigger project called Surf- Nit, which primary objective is to optimize the nitriding process in order to increase the use of nitrided steels for applications like high stress compo- nents. Today case hardening is the standard heat treatment for these applica- tions but nitriding is both more environmentally friendly and less time con- suming. In the present study, the steel grade with the highest content of ni- tride-forming elements and highest hardness showed the best wear re- sistance, regardless of the composition of the compound layer. Further, steels of a given grade but with different phase compositions of the compound layer showed differences in their wear behaviour. It was also shown that nitrided steels with ε-phase in the compound layer acted more brittle than those containing Υ’.

The goal of the more basic project is to increase the understanding of the mechanism behind sliding friction. The main focus has been the relation between friction and material transfer. A better understanding can be of help when developing new tribological materials, for example wear resistant components that can operate without lubrication. It could also enable specif- ic recommendations for surface finishes to avoid material transfer and be of help when trying to make more realistic tribological models. Scratch tests have been performed on samples with different surface roughness and dif- ferent surface composition. It was shown that nano scale topography had a bigger impact on both material transfer and friction compared to micro scale topography. Experiments both in air and in situ in a SEM have been per- formed to determine the effect of presence of air on the friction and material transfer. The experiments in air resulted in more material transfer and higher friction than those performed in vacuum. Both lubricated and unlubricated contacts have been studied in order to see how surfaces otherwise separated by boundary lubrication will be affected if the lubrication fails. 

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 2017. p. 91
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
urn:nbn:se:uu:diva-346738 (URN)
Presentation
2017-10-13, ITC 1245, Uppsala, 13:15 (Swedish)
Opponent
Supervisors
Funder
Swedish Research Council, 621-2013-5858
Available from: 2018-03-23 Created: 2018-03-21 Last updated: 2018-03-23Bibliographically approved

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Westlund, ViktoriaHeinrichs, JannicaOlsson, MikaelJacobson, Staffan

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