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Effect of oxide layers and near surface transformations on friction and wear during tool steel and boron steel interaction at high temperatures
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.ORCID iD: 0000-0003-1162-4671
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Machine Elements.
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: 0000-0003-3123-0303
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2015 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 330-331, p. 223-229Article in journal (Refereed) Published
Abstract [en]

Recent years have seen a continuously growing interest in high temperature tribological research. A significant part of this is driven by the need for improved understanding and knowledge pertaining to friction and wear and their control in the context of hot forming of high strength steels. Friction and wear characteristics of a sliding system are highly dependent on the properties of the two interacting surfaces. At high temperatures, the surface and material properties become extremely important since these systems often operate under unlubricated conditions. High temperature tribological processes are highly complex as these involve changes in mechanical properties due to microstructural changes; thermal softening; surface chemical and morphological changes due to oxidation and diffusion; deterioration of the surface and bulk material as a result of adhesive/abrasive wear and thermal fatigue. Many of these changes occur on the surfaces and/or in the near surface region. The formation of surface oxide layers and near surface layers with a highly refined microstructure (nano-structured) has been reported to have a significant influence on the tribological behaviour. An improved understanding of these effects is a prerequisite in an attempt towards controlling friction and wear at high temperatures. The main aim of this work is to investigate the formation of oxide layers and near surface transformed layers during tool steel and boron steel interaction at elevated temperatures and their relation to the friction and wear response. The results from sliding wear tests showed that under favourable conditions of temperature and load, a reduction of wear by three orders of magnitude and reduced friction by 50% was obtained. This was attributed to the formation of a composite layer structure involving a refined workhardened layer and a protective oxide layer on top. In the case of three body abrasive wear of boron steel, a reduction in wear rate when temperature increased (100–200 °C) has also been found. This reduction in three-body wear is due to the formation of a workhardened layer with a mechanically mixed layer of wear debris and fragmented silica particles on top. At higher temperatures (>500 °C), the softer matrix due to recrystallisation and phase transformations was unable to maintain a lower wear rate despite the presence of embedded fragmented silica particles.

Place, publisher, year, edition, pages
2015. Vol. 330-331, p. 223-229
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
URN: urn:nbn:se:ltu:diva-36956DOI: 10.1016/j.wear.2015.02.040ISI: 000357438000025Scopus ID: 2-s2.0-84937898091Local ID: acd1ca39-41b4-4e0f-9779-45077795919eOAI: oai:DiVA.org:ltu-36956DiVA, id: diva2:1010455
Conference
Intenational Conference on Wear Materials : 12/04/2015 - 16/04/2015
Note
Validerad; 2015; Nivå 1; 20150609 (andbra); Konferensartikel i tidskriftAvailable from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-07-10Bibliographically approved

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Hardell, JensHernandez, SinuheMozgovoy, SergejPelcastre, LeonardoCourbon, CedricPrakash, Braham

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Wear
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)

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