Kazutaka Asabe

TL;DR: In this paper, the α to γ transformation in ODS martensitic steel has been successfully achieved by introducing the α-to-γ transformation in 13Cr-3W ODS ferritic steels.

Abstract: As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

TL;DR: In this article, an oxide dispersion strengthened (ODs) ferritic steel cladding was used for long-life core materials of the fast reactors of the nuclear power plants.

TL;DR: In this article, fabrication tests of thin-walled cladding tubes were carried out from a viewpoint of future industrial manufacturing, and the manufactured claddings within the specification limit exhibited a superior high temperature strength and sufficient Charpy impact properties.

TL;DR: In this paper, the decarburization and deoxidation technique for permanent Nd-Fe-B magnet scrap is investigated, and the appropriate conditions for deoxification in the Ca-reduction and suppressing the re-oxidation in the leaching are investigated.