Effects of Oxygen Concentration on the Size Distribution of Oxide Particles in ODS Steel

Kim, Tae Kyu; Han, Chang Hee; Kang, Suk Hoon; Noh, Seong Jin; Jang, Jin-Sung

doi:10.2174/1573413709666131108230647

Cited by 3 publications

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“…For several decades, ODS steels have been developed as fuel cladding tube materials for sodium-cooled fast reactors (SFR). Recently, a 10 wt.% Cr ODS ferritic/martensitic steel with some minor elements has been newly developed for the in-core structural components of SFR, which has very attractive microstructures to achieve both superior creep and radiation resistances at high temperatures [1,4]. The oxide particles in the matrix act as sinks for defects such as helium bubbles, delay the nucleation of large voids and act as obstacles for the dislocation movement at high temperatures under neutron irradiation environment [5].…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of Nano-sized Oxide Particles Formed in Mechanically Alloyed Fe-10Cr-5Y2O3 Powders

Kim

Noh

2020

Metals

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Fe-10Cr-5Y2O3 powders were mechanically alloyed using a high energy horizontal ball-mill apparatus, and the effect of heat treatment on the behavior of nano-sized oxide particles formed in the mechanically alloyed Fe-10Cr-5Y2O3 powders was investigated. Elongated Cr-rich and Y-rich oxides were observed in the mechanically alloyed powders. During the heating of these powders above 700 °C, the elongated Cr-rich oxides were dramatically changed to a near- spherical morphology. Cubic-Y2O3, monoclinic-Y2O3 and YFeO3 phases were also found after heat treatment at 1150 °C for 1h, indicating that the Y-rich oxide phase was transformed to the cubic-Y2O3, monoclinic-Y2O3 and YFeO3 ones. It is thus concluded that both a morphological change of Cr-rich oxide and a phase transformation of Y-rich oxide during the heating of mechanically alloyed powders could be mainly attributed to extremely high energy, accumulated by the mechanical alloying process.

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Section: Introductionmentioning

confidence: 99%