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Microstructural, mechanical and tribological characterisation of roll materials for 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. Tribomaterials group, The Ångström Laboratory, Uppsala University, Sweden. (Tribologi)
2013 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 307, no 1-2, 209-217 p.Article in journal (Refereed) Published
Abstract [en]

The microstructure, mechanical and tribologicalproperties for three different materials, High Speed Steel, High Chromium ironand Indefinite Chill iron, used for hot strip mill work rolls have beenevaluated. Microstructural characterisation was performed using light opticalmicroscopy, scanning electron microscopy and energy dispersive X-rayspectroscopy. The mechanical and tribological properties were evaluated usingmicro Vickers indentation and scratch testing in combination with post-testmicroscopy. The microstructures of the investigated materials were found to berather complex with a number of secondary phases andalso materials with similar nominal composition display significant differenceswith respect to distribution, size and morphology of carbides. Scratch testing,including detection of friction coefficient, acoustic emission and penetrationdepth, gives valuable information concerning the mechanical and tribologicalresponse on a microscopic level of the investigated materials. Type,amount, distribution, size and morphology of the secondary phases in thematerials have a strong impact on the surface deformation and wear mechanismsduring scratching. Cracking and chipping are frequently observed in connectionto the ridges surrounding the scratches. However, cross-sectional analyses ofthe scratched microstructures reveal that cracking of the brittle carbidephases may extend to significant depths, >100 µm, reducing the mechanicalstrength of the material. Based on the results, it is believed that a moreisotropic microstructure, e.g. obtained via a powder metallurgy process, withfiner carbides would result in improved properties and performance in a hotrolling application.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 307, no 1-2, 209-217 p.
Keyword [en]
Work roll materials; Microstructure; Scratch testing;Surface deformation; Wear
National Category
Metallurgy and Metallic Materials
Research subject
Stålformning och ytteknik
Identifiers
URN: urn:nbn:se:du-11443DOI: 10.1016/j.wear.2013.09.002ISI: 000328523800026OAI: oai:DiVA.org:du-11443DiVA: diva2:576515
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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