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Internal oxidation and nitridation of hot rolled steels – a theoretical study and its experimental verification
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Auinger, Michael (2012) Internal oxidation and nitridation of hot rolled steels – a theoretical study and its experimental verification. In: GTT Annual Workshop 2012, Herzogenrath, Aachen, Germany, 11-13 Jul 2012
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Official URL: http://gtt.mch.rwth-aachen.de/gtt-web/Consulting/W...
Abstract
The properties and composition of polycrystalline specimens change tremendously during
oxidation. While exposing metallic alloys to the ambient at high temperatures (e.g. in steel
manufacture), the formation of oxides and nitrides along the grain boundaries and inside the
grains is observed.
Our aim is to elucidate the sequence of formed reaction products and to theoretically predict
the phase formation in binary and ternary iron alloys [1]. Thermodynamic assumptions are
used to determine stability and spatial distribution of oxide [2] and/or nitride [3] phases in
order to shine light on the processes which take place at high temperatures.
Simulations were composed as a subsequent 2-step based algorithm, consisting of element
migration and chemical reactions, assuming local equilibrium under manufacturing
conditions.
This has been realized by coupling the thermochemical subroutine ChemApp (GTTTechnologies,
Germany) to the numerical program COMSOL (COMSOL Inc., USA). The
results are presented as a two dimensional map, indicating the amount and spatial
distribution of each considered phase in a given sample microstructure.
These findings will be compared with experimental measurements in low oxygen activity
gases (i.e. no wustite formation on the sample) and characterized by surface sensitive
techniques such as Scanning Electron Microscopy (SEM) or Energy Dispersive X-Ray
Analysis (EDX).
| Item Type: | Conference Item (Speech) | ||||
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| Divisions: | Faculty of Science > WMG (Formerly the Warwick Manufacturing Group) | ||||
| Official Date: | 2012 | ||||
| Dates: |
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| Status: | Not Peer Reviewed | ||||
| Conference Paper Type: | Speech | ||||
| Title of Event: | GTT Annual Workshop 2012 | ||||
| Type of Event: | Workshop | ||||
| Location of Event: | Herzogenrath, Aachen, Germany | ||||
| Date(s) of Event: | 11-13 Jul 2012 | ||||
| Related URLs: |
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