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Challenges in the modelling of scale formation and decarburisation of high carbon, special and general steels
Swinden Technology Centre.
IJmuiden Technology Centre.
IRSID.
Keiper GmbH.
Show others and affiliations
2004 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 31, no 1, p. 57-65Article, review/survey (Refereed)
Abstract [en]

The oxygen bearing gases of the atmosphere in a reheating furnace oxidise the feedstock producing scale on the surface of the metal and, for high carbon steels, cause decarburisation of the surface layers. Modelling of these effects has to take into account the competitive nature of the two processes, scale formation and decarburisation, and complications that arise from changes in the controlling mechanism. Initially, the rate of scale formation may be controlled by effects in the gas phase, or nucleation of scale on the metal surface. Subsequently, scale growth is influenced by the gas composition and may be disturbed by the accumulation of oxidation products at the scale-metal interface. Voids and cracks within the scale may either inhibit solid state diffusion within the scale or provide channels for oxidising gas to access the scale-metal interface, For decarburisation, complications arise if a ferrite rim creates a step in the carbon profile or if retention of carbon monoxide within the scale provides a thermodynamic barrier to the reaction. This paper considers these complications and how they may be handled in mathematical models.

Place, publisher, year, edition, pages
2004. Vol. 31, no 1, p. 57-65
Keywords [en]
Decarburisation, Modelling, Oxidation, Scale growth, Steels
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13519DOI: 10.1179/030192304225012079Scopus ID: 2-s2.0-3042660126OAI: oai:DiVA.org:ri-13519DiVA, id: diva2:973728
Available from: 2016-09-22 Created: 2016-09-22 Last updated: 2017-11-21Bibliographically approved

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