Formation of nano-size oxide particles and I-ferrite at elevated temperature in 9Cr-ODS steel

Excellent high-temperature strength and resistance to radiation damage of 9Cr Oxide Dispersion Strengthened (9Cr-ODS) martensitic steel have been realized by nano-size Y-Ti-O complex oxide particles dispersed in the matrix and a dual phase structure consisting of alpha '-martensite and delta -f...

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Bibliographic Details
Published in:Journal of nuclear materials 2011-10, Vol.417 (1-3), p.209-212
Main Authors: Kim, Sawoong, Ohtsuka, Satoshi, Kaito, Takeji, Yamashita, Shinichiro, Inoue, Masaki, Asayama, Tai, Shobu, Takahisa
Format: Article
Language:English
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Summary:Excellent high-temperature strength and resistance to radiation damage of 9Cr Oxide Dispersion Strengthened (9Cr-ODS) martensitic steel have been realized by nano-size Y-Ti-O complex oxide particles dispersed in the matrix and a dual phase structure consisting of alpha '-martensite and delta -ferrite. These are produced by mechanically alloying Fe-Cr-Ti powders with Y sub(2)O sub(3) followed by a hot-consolidation process. Therefore, the hot-consolidation process is the issue to be clarified for the formation of nano-size oxide particle and delta -ferrite. The temperature dependence of the formation and development of nano-size oxide particles and delta -ferrite using mechanically alloyed 9Cr-ODS raw powder were investigated applying X-ray Diffraction and Small Angle X-ray Scattering measurement at SPring-8 and by Electron Probe Micro Analysis. In situ heating measurement techniques with XRD and SAXS enabled real-time observation of phase transformations and allowed correlation between formation of nano-size oxide particle and delta -ferrite.
ISSN:0022-3115
DOI:10.1016/j.jnucmat.2011.01.063