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Courbon, Cedric
Publications (8 of 8) Show all publications
Decrozant-Triquenaux, J., Pelcastre, L., Courbon, C., Prakash, B. & Hardell, J. (2019). Tribological Behaviour of PVD Coated Tool Steels in Hot Forming of Aluminium Alloys. In: CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel: . Paper presented at CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019.
Open this publication in new window or tab >>Tribological Behaviour of PVD Coated Tool Steels in Hot Forming of Aluminium Alloys
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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.

Keywords
high temperature tribology, aluminium, lubrication, PVD coatings, material transfer, adhesion
National Category
Mechanical Engineering
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-73799 (URN)
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
Courbon, C., Fallqvust, M., Hardell, J., M'Saoubi, R. & Prakash, B. (2015). Adhesion tendency of PVD TiAlN coatings at elevated temperatures during reciprocating sliding against carbon steel (ed.). Paper presented at Intenational Conference on Wear Materials : 12/04/2015 - 16/04/2015. Wear, 330-331, 209-222
Open this publication in new window or tab >>Adhesion tendency of PVD TiAlN coatings at elevated temperatures during reciprocating sliding against carbon steel
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2015 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 330-331, p. 209-222Article in journal (Refereed) Published
Abstract [en]

This work focussed on assessing the contact conditions driving the adhesion tendency of PVD TiAlN coated cemented carbide during reciprocating sliding against a normalized AISI 4137 carbon steel. A special emphasis is given to the surface topography of the coating. Results are analysed in terms of friction and material transfer over a large range of temperatures (up to 800 °C) and contact pressures. The post-test surface analysis of the specimens is conducted in order to understand the tribological behaviour and elucidate the formation mechanisms of transfer layers. A numerical model is developed to assess the amount of heat effectively transmitted into the first bodies and the temperature of the surfaces in contact.Whereas temperatures close to 400 °C ensure the formation of a stable tribofilm reducing friction, the highest temperatures lead to unstable frictional behaviour. Coating surface topography has been seen to be a major parameter driving material transfer during the first stages of the contact and the formation of a transfer layer. Thin and homogeneous layers are almost instantaneously formed with a polished surface whereas some time is required with a rougher one to form a film. A large amount of the frictional power is dissipated into these layers and high temperatures can be reached at the surface due to frictional heating. Contact pressure is found to be a parameter promoting transfer and oxidation

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-34750 (URN)10.1016/j.wear.2015.01.026 (DOI)000357438000024 ()2-s2.0-84937829854 (Scopus ID)9079582a-f131-4dda-926a-ec58f1b1e897 (Local ID)9079582a-f131-4dda-926a-ec58f1b1e897 (Archive number)9079582a-f131-4dda-926a-ec58f1b1e897 (OAI)
Conference
Intenational Conference on Wear Materials : 12/04/2015 - 16/04/2015
Note

Validerad; 2015; Nivå 1; 20150609 (andbra); Konferensartikel i tidskrift

Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-08-16Bibliographically approved
Hardell, J., Hernandez, S., Mozgovoy, S., Pelcastre, L., Courbon, C. & Prakash, B. (2015). Effect of oxide layers and near surface transformations on friction and wear during tool steel and boron steel interaction at high temperatures (ed.). Paper presented at Intenational Conference on Wear Materials : 12/04/2015 - 16/04/2015. Wear, 330-331, 223-229
Open this publication in new window or tab >>Effect of oxide layers and near surface transformations on friction and wear during tool steel and boron steel interaction at high temperatures
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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.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-36956 (URN)10.1016/j.wear.2015.02.040 (DOI)000357438000025 ()2-s2.0-84937898091 (Scopus ID)acd1ca39-41b4-4e0f-9779-45077795919e (Local ID)acd1ca39-41b4-4e0f-9779-45077795919e (Archive number)acd1ca39-41b4-4e0f-9779-45077795919e (OAI)
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
Pelcastre, L., Hardell, J., Courbon, C. & Prakash, B. (2015). Tribological behaviour of Al-Si-coated ultra-high-strength steel during interaction with tool steel at elevated temperatures: Influence of tool steel surface topography parameters on galling (ed.). Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, 229(8), 1373-1384
Open this publication in new window or tab >>Tribological behaviour of Al-Si-coated ultra-high-strength steel during interaction with tool steel at elevated temperatures: Influence of tool steel surface topography parameters on galling
2015 (English)In: Proceedings of the Institution of mechanical engineers. Part B, journal of engineering manufacture, ISSN 0954-4054, E-ISSN 2041-2975, Vol. 229, no 8, p. 1373-1384Article in journal (Refereed) Published
Abstract [en]

Galling is a severe form of adhesive wear encountered in metal forming operations. In hot stamping, an Al-Si coating is normally applied onto the ultra-high-strength steels to prevent decarburisation and to improve the corrosion resistance of the steel. Material transfer occurring from the coated ultra-high-strength steel to the tool surface has been identified as major issue in hot stamping. This transferred material impairs the quality of the produced parts and at the same time, it increases the costs of maintenance of the tools. This work focuses on the understanding of surface topography parameters and their effect on galling. Surface roughness level and orientation of the surface lay on tool surface have been studied. The results showed that a single parameter of the surface topography is not enough to describe the resistance to galling. Parameters such as Rv, Rp and Rsk are also important to consider in order to rank the galling resistance of the surface. The sliding direction with respect to the surface lay also had a significant influence on galling; sliding in the direction parallel to it resulted in substantially reduced material transfer.

National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements; Centre - Centre for High Performance Steel (CHS)
Identifiers
urn:nbn:se:ltu:diva-8372 (URN)10.1177/0954405414535920 (DOI)000360083300009 ()2-s2.0-84955271814 (Scopus ID)6e18e0fb-28a0-404f-8ce1-1ca8cd632e1d (Local ID)6e18e0fb-28a0-404f-8ce1-1ca8cd632e1d (Archive number)6e18e0fb-28a0-404f-8ce1-1ca8cd632e1d (OAI)
Note

Validerad; 2015; Nivå 2; 20140702 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2019-03-29Bibliographically approved
Hernandez, S., Hardell, J., Courbon, C., Winkelmann, H. & Prakash, B. (2014). High temperature friction and wear mechanism map for tool steel and boron steel tribopair (ed.). Paper presented at . Tribology - Materials, Surfaces & Interfaces, 8(2), 74-84
Open this publication in new window or tab >>High temperature friction and wear mechanism map for tool steel and boron steel tribopair
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2014 (English)In: Tribology - Materials, Surfaces & Interfaces, ISSN 1751-5831, E-ISSN 1751-584X, Vol. 8, no 2, p. 74-84Article in journal (Refereed) Published
Abstract [en]

Tribological systems working under severe conditions like high pressures, sliding velocities and temperatures are subjected to different phenomena such as wear, oxidation and changes in mechanical properties. In many cases, there are several mechanisms occurring simultaneously.The predominating type(s) of wear mechanism(s) presented will depend on the materials in contact, operating parameters and surrounding environment. In this work, high temperature tribological studies of boron steel sliding against tool steel were conducted using a pin-on-disc machine under unlubricated conditions at five different temperatures ranging from 25 to 400C, three different loads: 25, 50 and 75 N (contact pressures of 2, 4 and 6 MPa respectively) and a sliding speed of 0.2 ms-1. Scanning electron microscopy/energy dispersive spectroscopy and X-ray techniques were used for analysing the resulting damage and tribolayers of the worn surfaces. Additionally, hardness measurements were carried out in a special hot hardness rig in the same temperature range as that used in pin-on-disc tests. The results have shown that for a given load, the wear rate of boron steel decreased as the temperature increased, reaching itslowest value at 400C at 50 N. In the case of the tool steel, it could be observed that at 200C and above, the wear rate decreased as the load increased. This behaviour is consistent with the formation of a protective oxidised layer initiated at 100C. At higher temperatures, such layers become more pronounced. The obtained data were finally used to construct a friction and wear mechanism map for this material pair that takes temperature and pressure into account.

Keywords
Tribology, high-temperature, pressure, glaze layer, tool steel, boron steel, wear, Materials science - Other material science, Teknisk materialvetenskap - Övrig teknisk materialvetenskap
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-3481 (URN)10.1179/1751584X13Y.0000000049 (DOI)2-s2.0-84898067455 (Scopus ID)14f701d8-3b49-4a3e-be2c-7bfb438faea6 (Local ID)14f701d8-3b49-4a3e-be2c-7bfb438faea6 (Archive number)14f701d8-3b49-4a3e-be2c-7bfb438faea6 (OAI)
Note
Validerad; 2014; 20140414 (sinher)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Courbon, C., Fallqvust, M., Hardell, J., Saoubi, R. & Prakash, B. (2014). Influence of temperature and surface topography on friction and adhesion tendency of PVD TiAIN coating (ed.). Paper presented at ASIATRIB 2014 : Green Tribology 17/02/2014 - 20/02/2014. Paper presented at ASIATRIB 2014 : Green Tribology 17/02/2014 - 20/02/2014.
Open this publication in new window or tab >>Influence of temperature and surface topography on friction and adhesion tendency of PVD TiAIN coating
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2014 (English)Conference paper, Oral presentation only (Refereed)
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-35363 (URN)9df522a9-99d2-4055-9c81-667c1854aacd (Local ID)9df522a9-99d2-4055-9c81-667c1854aacd (Archive number)9df522a9-99d2-4055-9c81-667c1854aacd (OAI)
Conference
ASIATRIB 2014 : Green Tribology 17/02/2014 - 20/02/2014
Note
Godkänd; 2014; 20140317 (andbra)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Prakash, B., Courbon, C. & Hardell, J. (2013). High temperature tribology research: needs and opportunities (ed.). Paper presented at International Conference on Advances in Tribology & Engineering Systems : 15/10/2013 - 17/10/2013. Paper presented at International Conference on Advances in Tribology & Engineering Systems : 15/10/2013 - 17/10/2013.
Open this publication in new window or tab >>High temperature tribology research: needs and opportunities
2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-34693 (URN)8f5c9b6c-b57c-42df-affb-ff2d3339479c (Local ID)8f5c9b6c-b57c-42df-affb-ff2d3339479c (Archive number)8f5c9b6c-b57c-42df-affb-ff2d3339479c (OAI)
Conference
International Conference on Advances in Tribology & Engineering Systems : 15/10/2013 - 17/10/2013
Note
Godkänd; 2013; 20140307 (jenhar)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
Hernandez, S., Hardell, J., Courbon, C., Winkelmann, H. & Prakash, B. (2013). Influence of load on friction and wear of tool steel - boron steel pair at elevated temperatures (ed.). Paper presented at International Tribology Symposium of IFToMM : 19/03/2013 - 21/03/2013. Paper presented at International Tribology Symposium of IFToMM : 19/03/2013 - 21/03/2013.
Open this publication in new window or tab >>Influence of load on friction and wear of tool steel - boron steel pair at elevated temperatures
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2013 (English)Conference paper, Oral presentation only (Refereed)
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear)
Research subject
Machine Elements
Identifiers
urn:nbn:se:ltu:diva-32271 (URN)6b67b6c6-f295-41fd-b885-8d44b9f7c08b (Local ID)6b67b6c6-f295-41fd-b885-8d44b9f7c08b (Archive number)6b67b6c6-f295-41fd-b885-8d44b9f7c08b (OAI)
Conference
International Tribology Symposium of IFToMM : 19/03/2013 - 21/03/2013
Note
Godkänd; 2013; 20130521 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-01-14Bibliographically approved
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