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Challenges in the modelling of scale formation and decarburisation of high carbon, special and general steels
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2004 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 31, no 1, p. 57-65Article in journal (Refereed) Published
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]
Decarburization, Carbon, Nucleation, Oxidation, Rate constants, Chemical reactions, Crack initiation, Atmospheric humidity, Diffusion, Linear equations, Mathematical models
National Category
Mechanical Engineering
Research subject
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-4571DOI: 10.1179/030192304225012079OAI: oai:DiVA.org:oru-4571DiVA, id: diva2:138870
Note
Awarded with "William's Award" for the most significant paper of the year.Available from: 2007-07-12 Created: 2007-07-12 Last updated: 2017-12-14Bibliographically approved

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Jarl, Magnus

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CiteExportLink to record
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Citation style
  • apa
  • ieee
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  • vancouver
  • Other style
More styles
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  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf