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Tribological testing of some potential PVD and CVD coatings for steel wire drawing dies
Dalarna University, School of Technology and Business Studies, Material Science.
Dalarna University, School of Technology and Business Studies, Material Science.
2011 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 273, no 1, 55-59 p.Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the possibility to replace cemented carbide wire drawing dies with CVD or PVD coated steel dies. Material pick-up tendency, friction and wear characteristics of four different commercial coatings – CVD TiC and PVD (Ti,Al)N, CrN and CrC/C – in sliding contact with ASTM 52100 bearing steel were evaluated using pin-on-disc testing. The load bearing capacity of the coating/substrate composites was evaluated using scratch testing. The results show that the friction characteristics and material pick-up tendency of the coatings to a large extent is controlled by the surface topography of the as-deposited coatings which should be improved by a polishing post-treatment in order to obtain a smooth surface. Based on the results obtained in this study, three different coatings – CrC/C, TiC and dual-layer TiC/CrC/C – are recommended to be evaluated in wire drawing field tests. CrC/C and TiC are recommended due to their intrinsic low friction properties and material pick-up tendency in sliding contact with steel. The dual-layer is recommended in order to combine the good properties of the two coatings CrC/C (low shear strength) and TiC (high hardness).

Place, publisher, year, edition, pages
Amsterdam: Elsevier , 2011. Vol. 273, no 1, 55-59 p.
Keyword [en]
Drawing die; PVD coating; CVD coating; Material transfer
National Category
Tribology
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-6239DOI: 10.1016/j.wear.2011.06.020ISI: 000297902500010OAI: oai:dalea.du.se:6239DiVA: diva2:520535
Available from: 2012-01-24 Created: 2012-01-24 Last updated: 2015-06-16Bibliographically approved
In thesis
1. Tribology in Metal Working
Open this publication in new window or tab >>Tribology in Metal Working
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis focuses on the tribological performance of tool surfaces in two steel working operations, namely wire drawing and hot rolling. In all forming operations dimensions and surface finish of the products are of utmost importance. Forming basically includes three parts – forming conditions excluded – that may be changed; work material, tool and (possibly) lubricant. In the interface between work material and tool, the conditions are very aggressive with – generally or locally – high temperatures and pressures. The surfaces will be worn in various ways and this will change the conditions in the process. Consequently, the surface finish as well as the dimensions of the formed product may change and in the end, the product will not fulfil the requirements of the customer. Therefore, research and development in regard to wear, and consequently tribology, of the forming tools is of great interest.

The investigations of wire drawing dies focus on coating adhesion/cohesion, surface characteristics and material transfer onto the coated steel both in laboratory scale as well as in the wire drawing process. Results show that it in wire drawing is possible to enhance the tribological performance of drawing dies by using a lubricant together with a steel substrate coated by a polished, dual-layer coating containing both hard and friction-lowering layers.

The investigations of hot rolling work rolls focus on microstructure and hardness as well as cracking- and surface characteristics in both laboratory scale and in the hot strip mill. Results show that an ideal hot work roll material should be made up of a matrix with high hardness and a large amount of complex, hard carbides evenly distributed in the microstructure. The surface failure mechanisms of work rolls are very complex involving plastic deformation, abrasive wear, adhesive wear, mechanical and thermal induced cracking, material transfer and oxidation.

This knowledge may be used to develop new tools with higher wear resistance giving better performance, lower costs and lower environmental impact.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 52 p.
Keyword
tribology, friction, wear, metal working, coatings, wire drawing, hot work rolls
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Research subject
Stålformning och ytteknik
Identifiers
urn:nbn:se:du-11730 (URN)
Presentation
2012-12-14, Clas Ohlson, Skomakargatan 1, Borlänge, 13:00 (Swedish)
Opponent
Supervisors
Available from: 2013-01-18 Created: 2013-01-18 Last updated: 2013-01-18Bibliographically approved

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