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An investigation of worn work roll materials used in the finishing stands of the hot strip mill for steel rolling
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
Högskolan Dalarna, Akademin Industri och samhälle, Materialteknik.
2012 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
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 the material microstructure and especially the presence and distribution of microstructural constituents, such as the different carbide phases and graphite (in the case of Indefinite Chill Iron). 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.

sted, utgiver, år, opplag, sider
2012.
Emneord [en]
Work rolls, hot strip mill, surface failure, wear, cracking
HSV kategori
Forskningsprogram
Stålformning och ytteknik
Identifikatorer
URN: urn:nbn:se:du-12775OAI: oai:DiVA.org:du-12775DiVA, id: diva2:641354
Konferanse
Nordtrib 2012, Trondheim, 12-15 juni 2012
Tilgjengelig fra: 2013-08-16 Laget: 2013-08-16 Sist oppdatert: 2013-08-19bibliografisk kontrollert

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An investigation of worn work roll materials used in the finishing stands of the hot strip mill for steel rolling(793 kB)567 nedlastinger
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