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Grain boundary ridge formation during initial high temperature oxidation of Mn/Al TRIP steel
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh.
2007 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 87, no 23, 3479-3499 p.Article in journal (Refereed) Published
Abstract [en]

Confocal scanning laser microscopy (CSLM) was used in real-time observation of alloy element oxidation of a Mn/Al TRIP steel in an Ar-O-2 atmosphere. CSLM images reveal a marked role of grain boundaries in the overall initial oxidation kinetics of the alloy, and consequently in the morphology of the initial surface oxide. The oxidation on the alloy surface is dominated by the formation of Mn-rich oxide ridges along grain boundary traces on the surface. Oxide ridge formation kinetics was quantified by measurements on images extracted from real-time recordings of surface oxide evolution. Oxide ridge growth was found to take place at a constant rate. Scanning electron microscopy (SEM) images of the oxidized surfaces showed homogenous oxide ridges along straight grain boundary traces and heterogeneous oxide ridges along non-straight grain boundary traces. A transport mechanism of Mn to the surface is proposed, which relies on grain boundary segregation of Mn and on a relationship between grain boundary diffusivity and grain boundary character. It is suggested that when regarding alloys with significant grain boundary segregation of a solute, separate Wagner balances for internal vs. external oxidation is required for the grain lattices and the grain boundaries, respectively.

Place, publisher, year, edition, pages
2007. Vol. 87, no 23, 3479-3499 p.
Keyword [en]
Argon, Confocal microscopy, Diffusion, Grain boundaries, Image processing, Kinetics, Morphology, Real time systems, Scanning electron microscopy, Thermooxidation, Mn/Al TRIP steel, Oxide ridge formation, Surface oxide, Wagner balances
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-8548DOI: 10.1080/14786430701324139ISI: 000248144200009Scopus ID: 2-s2.0-34547310458OAI: oai:DiVA.org:kth-8548DiVA: diva2:13901
Note
QC 20100914Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2010-11-25Bibliographically approved
In thesis
1. Grain Boundary Ridge Formation during High Temperature Oxiditation of Manganese Containing Steels
Open this publication in new window or tab >>Grain Boundary Ridge Formation during High Temperature Oxiditation of Manganese Containing Steels
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2008. 42 p.
Keyword
grain boundary ridges, TRIP-steel, IF-steel, recrystalization, hight temperature oxidation, selective oxidation grain boundary diffusion, grain boundary segregation, Mn
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-4778 (URN)978-91-7415-000-1 (ISBN)
Public defence
2008-06-05, Sal D3, KTH, Lindstedtsvägen 5 entréplan, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100927Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2010-09-27Bibliographically approved
2. Grain boundary ridge formation during initial high temperature oxidation of Mn/Al TRIP steel
Open this publication in new window or tab >>Grain boundary ridge formation during initial high temperature oxidation of Mn/Al TRIP steel
2006 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH, 2006. 19 p.
Series
KTH/MSE--06/17--SE+THMETU AVH
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-4081 (URN)91-7178-334-2 (ISBN)
Presentation
2006-04-28, B3, KTH, Brinellvägen 23, Stockholm, 10:00
Note
QC 20101125Available from: 2006-08-23 Created: 2006-08-23 Last updated: 2010-11-25Bibliographically approved

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