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An investigation of worn work roll materials used in the finishing stands of the hot strip mill for steel rolling
Dalarna University, School of Technology and Business Studies, Materials Technology. (Tribologi)
Dalarna University, School of Technology and Business Studies, Materials Technology. (Tribologi)
2013 (English)In: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, Vol. 227, no 8, 837-844 p.Article in journal (Refereed) Published
Abstract [en]

The surface failure characteristics of different work roll materials, i.e. High Speed Steel, High Chromium Iron and Indefinite Chill Iron, used in the finishing stands of a hot strip mill have been investigated using stereo microscopy, 3D optical profilometry, scanning electron microscopy and energy dispersive X-ray spectroscopy. The results show that the surface failure mechanisms of work rolls for hot rolling are very complex, involving plastic deformation, abrasive wear, adhesive wear, mechanical and thermal induced cracking, material transfer and oxidation. Despite the differences in chemical composition and microstructure, the tribological response of the different work roll materials was found to be strongly dependent on second phase constituents such as the size, morphology and distribution of different carbide phases and graphite (in the case of Indefinite Chill Iron) which was found to promote cracking. Cracking and chipping of the work roll surfaces, both having a negative impact on work roll wear, are strongly influenced by the presence of carbides, carbide networks and graphite in the work roll surface. Consequently, the amount of carbide forming elements as well as the manufacturing process must be controlled in order to obtain an optimised microstructure and a predictable wear rate.

Place, publisher, year, edition, pages
Sage Publications, 2013. Vol. 227, no 8, 837-844 p.
Keyword [en]
Work rolls, hot strip mill, surface failure, wear, cracking
National Category
Manufacturing, Surface and Joining Technology
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-11444DOI: 10.1177/1350650113478333ISI: 000321702800004OAI: oai:DiVA.org:du-11444DiVA: diva2:576517
Available from: 2012-12-13 Created: 2012-12-13 Last updated: 2015-06-29Bibliographically 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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