Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Kinetic Approach for Growth and Coalescence of Nano-Size Oxide Particles in 9Cr-ODS Steel Using High-Energy Synchrotron Radiation X-rays in SPring-8
Sa-Woong KimTakahisa ShobuSatoshi OhtsukaTakeji KaitoMasaki InoueMasato Ohnuma
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2009 Volume 50 Issue 4 Pages 917-921


Nanometer size oxide particles in 9Cr-ODS steel are dispersed finely and densely in a matrix by the hot-solidification process. The size and density distribution of dispersed oxide particles is recognized as one of the main issues for ensuring good microstructural stability and high temperature strength in a high temperature (<700°C) and neutron irradiation (250 dpa) environment. However, the behavior of oxide particles in the hot-solidification process has not been determined yet. This study evaluated the correlation between nano-size oxide particles and the heat treatment temperature and time in order to characterize the mechanism of formation and the behavior during growth and coalescence of these particles in 9Cr-ODS steel raw powder. XRD and SAXS measurements were made using high-energy synchrotron radiation X-rays in SPring-8. This is the first report of the oxide complex particles (Y2Ti2O7 and Y2TiO5) being formed from 800 to 960°C, and they were observed to grow and coalesce on increasing both heat-treatment temperature and time.

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© 2009 The Japan Institute of Metals and Materials
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