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Abstract
AbstractThe development status of 9Cr–oxide dispersion strengthened (ODS) ferritic steels was reviewed, focusing on the authors' activities. This material is the most prospective cladding of the advanced high burn-up fuel elements for Japanese prototype fast breeder reactor MONJU and international Generation IV advanced fast reactors, because of their inherent radiation resistance as well as superior high temperature strength. The Y2Ti2O7 complex oxide particles in nano-scale are precipitated through the dissolution of Y2O3 by mechanical alloying processing, followed by annealing at elevated temperatures >1273 K. The formation of the unique phase, residual alpha-ferrite, containing nano-oxide particles, can be controlled in terms of an amount of excess oxygen and titanium. The meso-scale residual alpha–ferrite formation induces the extremely highest creep rupture strength in this class of ferritic steel tubes. The new processing for cladding manufacturing of 9Cr–ODS ferrite steels was realised by using al...
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