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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.
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: urn:nbn:se:kth:diva-4081ISBN: 91-7178-334-2 (print)OAI: oai:DiVA.org:kth-4081DiVA: diva2:10657
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
List of papers
1. 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
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.

Keyword
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:nbn:se:kth:diva-8548 (URN)10.1080/14786430701324139 (DOI)000248144200009 ()2-s2.0-34547310458 (Scopus ID)
Note
QC 20100914Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2017-12-14Bibliographically approved
2. The Role of Grain Boundary Diffusion in Initial Selective Oxidation Kinetics of a Manganese-Aluminum TRIP Steel
Open this publication in new window or tab >>The Role of Grain Boundary Diffusion in Initial Selective Oxidation Kinetics of a Manganese-Aluminum TRIP Steel
2005 (English)In: Journal of Phase Equilibria and Diffusion, ISSN 1547-7037, Vol. 26, no 5, 539-546 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 manganese/aluminum transformation induced plasticity (TRIP) steel. 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. Changing the grain size and the oxidation temperature results in a change in the overall kinetics of selective oxidation and in the importance of oxidation at grain boundaries, respectively. Electron backscattered diffraction mapping was used to characterize the grain boundaries intersecting the surface over an area of the alloy. Subsequent CSLM observation of selective oxidation over the same area allowed quantification of oxidation kinetics as a function of individual grain boundary misorientation.

Keyword
Electron diffraction, Grain boundaries, Morphology, Oxidation, Plasticity, Reaction kinetics, Confocal scanning laser microscopy (CSLM), Selective oxidation, Surface oxides, Transformation induced plasticity (TRIP)
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-8547 (URN)10.1361/154770305X66691 (DOI)000232570000023 ()
Note
QC 20100914. Uppdaterad från submitted till published (20100914).Available from: 2008-06-02 Created: 2008-06-02 Last updated: 2010-11-25Bibliographically approved

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