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High temperature oxidation of chromium: Kinetic modeling and microstructural investigation
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Physical Metallurgy.
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2013 (English)In: Solid State Ionics, ISSN 0167-2738, E-ISSN 1872-7689, Vol. 240, 41-50 p.Article in journal (Refereed) Published
Abstract [en]

Using CALPHAD methods, Cr2O3 growth on pure Cr is modeled using DICTRA and the vacancy model for diffusion. The results are compared with thermobalance and TEM experiments at 625 and 700 degrees C in O-2. The experimental scatter is significant, leading to a compromise suggestion. With the experimental conditions from the furnace exposures in this work, optimized mobilities are validated with a series of oxidation simulations. Despite the complex microstructure and initial growth rate variations, it is possible to reproduce the experimental oxide thicknesses with good accuracy, allowing for extension to multicomponent systems.

Place, publisher, year, edition, pages
2013. Vol. 240, 41-50 p.
Keyword [en]
High temperature corrosion, Stainless steel, SEM, TEM, Kinetic parameters
National Category
Metallurgy and Metallic Materials
URN: urn:nbn:se:kth:diva-124286DOI: 10.1016/j.ssi.2013.02.017ISI: 000319242600006ScopusID: 2-s2.0-84876242848OAI: diva2:634907
Swedish Foundation for Strategic Research

QC 20130702

Available from: 2013-07-02 Created: 2013-06-28 Last updated: 2014-10-23Bibliographically approved
In thesis
1. On high temperature oxidation resistance: Towards the materials genome of high temperature alloys
Open this publication in new window or tab >>On high temperature oxidation resistance: Towards the materials genome of high temperature alloys
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The efficiency of a heat engine increases with increasing service temperature. This leads to a demand for material that can withstand aggressive environments and sometimes also high load at higher and higher temperature. That is the rationale for the work of this thesis. It is divided into two parts, both addressing model alloy systems for components used in oxidizing high temperature environments. In the first part the phase equilibria and phase diagrams of Ni-Ru and Al-Ni-Ru are investigated from a thermodynamic point of view using the well known Calphad method. In particular, the debated existance of a miscibility gap between the aluminides NiAl and RuAl is considered. This led to a combined ab initio/Calphad approach and it is suggested that there is a miscibility gapat low temperature. In the second part, first of its kind diffusion simulations in oxides are performed in the technologically important Fe-O and Cr-O systems. In the simulations, the moving phase boundary problem is solved with use of temperature and composition dependent diffusion coefficients, that are evaluated for complex oxide phases modeled with up to four sublattices. This type of simulations attracts a lot of interest and it looks very promising for future extension to higher order systems.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. vii, 32 p.
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
urn:nbn:se:kth:diva-154227 (URN)978-91-7595-313-7 (ISBN)
Public defence
2014-11-14, B2, Brinellvägen 23, KTH, Stockholm, 10:00 (English)

QC 20141222

Available from: 2014-10-22 Created: 2014-10-15 Last updated: 2014-10-23Bibliographically approved

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Hallström, SamuelHöglund, LarsÅgren, John
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