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Effect of Secondary Nitride Particles on Grain Growth in a Fe-20 mass% Cr Alloy Deoxidised with Ti and Zr
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2013 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 53, no 3, 476-483 p.Article in journal (Refereed) Published
Abstract [en]

The pinning effects of different particles on grain growth were investigated in Fe-20 mass% Cr alloys deoxidised with Ti and Zr. More specifically, in-situ observations of the specimen surface were made during heat treatment at 1 200 and 1 400 degrees C in a High Temperature - Confocal Scanning Laser Microscope (HT-CSLM). Initially, primary and secondary particles were investigated using thermodynamic equilibrium calculations and the SEM/EDX observations. Thereafter, the pinning effect of secondary nitride particles on grain boundary migration and the kinetics of the grain growth process were investigated. It was found that secondary nitride particles generally have a considerable effect on the pinning of grain boundary migration during heating treatment. This is especially true for heat treatment at 1 400 degrees C. Despite that the pinning effect of TIN particles decreases due to dissolution of these particles, the implicit pinning effects of ZrO2, ZrO2-ZrN and ZrO2-ZrN-TiN particles appear. Thus, despite that TIN individually is ineffective in causing grain-boundary pinning at high-temperature, TiN is effective as a compound with ZrO2 and ZrN in pinning grain-boundaries at high temperatures. The changing of the uniformity of grain size distributions during grain growth at different N contents and temperatures was discussed based on the consideration of the geometric standard deviation of the grain size distribution (sigma(g)).

Place, publisher, year, edition, pages
2013. Vol. 53, no 3, 476-483 p.
Keyword [en]
Fe-Cr alloy, Ti and Zr deoxidation, grain size distribution, grain growth, pinning effect, particle size distribution, N content
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-121503DOI: 10.2355/isijinternational.53.476ISI: 000316776500013Scopus ID: 2-s2.0-84876382479OAI: oai:DiVA.org:kth-121503DiVA: diva2:619658
Note

QC 20130506

Available from: 2013-05-06 Created: 2013-04-29 Last updated: 2017-12-06Bibliographically approved

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Janis, JesperKarasev, AndreyNakajima, KeijiJönsson, Pär Göran
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