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Preparation and Characterization of ODS-alloys for Fusion Reactor Applications
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Two batches of reduced activation oxide dispersion strengthened (ODSRAF) ferritic steel with the nominal composition of Fe-14Cr-2W-0.3Ti-0.24Y in wt% were produced by mechanical alloying of elemental powders (Fe, Cr, W, Ti and Y) in hydrogen atmosphere and subsequent consolidation by hot isostatic pressing (HIP) followed by thermal treatments. The changes in the characteristics of the powder particles induced by mechanical alloying were investigated. Scanning electron microscope (SEM) analysis revealed the homogeneity of the alloyed powder as well as the presence of precipitates and absence of pores in the consolidated material. Laser diffraction (LD) analysis revealed that the mechanically alloyed powder was composed of particles having an average particle size of 23 μm. The C, N, O and S contents in the alloys were measured to evaluate quantitatively the contamination induced by the powder processing. Vickers hardness measurements were performed on particles of the alloyed powders and on the consolidated material before and after thermal treatments. It was found that hardness is strongly dependent on the temperature. The density and elastic moduli of the consolidated material were also measured. The density resulted in 99.6% of the density calculated applying the phase mixture rule.

Place, publisher, year, edition, pages
EES Examensarbete / Master Thesis
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-102044OAI: diva2:550489
Educational program
Master of Science - Nuclear Fusion Science and Engineering Physics
Available from: 2012-09-07 Created: 2012-09-07 Last updated: 2012-09-07Bibliographically approved

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