Suppression effect of nano-sized oxide particles on helium irradiation hardening in F82H-ODS steel

The oxidation resistance of 18%Cr-oxide dispersion strengthened (ODS) ferritic steels with and without 5%Al has been investigated in air at 700900 °C for time period up to 540 h. The oxidation rate of ODS steels is significantly dependent on the oxidation time and temperature. Compared to Al-containing ODS steel, the finer grains of Al-free ODS steel are due to the formation of smaller coherent oxide particles which suppress the steel's grain growth. The grain refinement of ODS steels is expected to allow rapid segregation of Cr or Al to the steel surface, so that the continuous Fe-Cr spinel or alumina layer is formed quickly in comparison to the alloys without oxide particles dispersion. Therefore, the excellent oxidation resistance of ODS steels is owing to the formation of continuous, protective oxide layers which correlate with oxide nanoparticles and grain refinement.

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Atom probe tomography analysis of Ti-Y-O clustering during processing of nanoscale oxide particles in 14%Cr ODS ferritic steels

MRS Proceedings ◽

10.1557/opl.2011.328 ◽

2011 ◽

Vol 1298 ◽

Cited By ~ 1

Author(s):

Ceri A. Williams ◽

Paulina Unifantowicz ◽

Zbigniew Oksiuta ◽

Nadine Baluc ◽

George D. W. Smith ◽

...

Keyword(s):

Atom Probe Tomography ◽

Atom Probe ◽

Ferritic Steels ◽

Ods Steel ◽

Atom Probe Tomography Analysis ◽

Oxide Particles ◽

Tomography Analysis

ABSTRACTAtom probe tomography is used to investigate the clustering of Y-Ti-O in a 14%Cr-2%W-0.3%Ti & 0.3% Y2O3 ODS steel. The clusters in the consolidated material are compared to clusters observed in the powder prior to consolidation. A higher density of smaller clusters is observed in the powder, and the clusters are found to contain more O and less Y.

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Effect of recrystallization on ion-irradiation hardening and microstructural changes in 15Cr-ODS steel

Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and Atoms ◽

10.1016/j.nimb.2015.07.076 ◽

2015 ◽

Vol 365 ◽

pp. 313-318 ◽

Cited By ~ 10

Author(s):

Yoosung Ha ◽

Akihiko Kimura

Keyword(s):

Ion Irradiation ◽

Irradiation Hardening ◽

Microstructural Changes ◽

Ods Steel

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Stability of oxide particles under electron irradiation in a 9Cr ODS steel at 400 °C

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2014.09.011 ◽

2014 ◽

Vol 455 (1-3) ◽

pp. 724-727 ◽

Cited By ~ 12

Author(s):

Feng Li ◽

Hiroaki Abe ◽

Takahiro Ishizaki ◽

Yanfen Li ◽

Takuya Nagasaka ◽

...

Keyword(s):

Electron Irradiation ◽

Ods Steel ◽

Oxide Particles

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Evolution of Oxide Particles during Fabrication Processes of 12Cr ODS Steel

MRS Proceedings ◽

10.1557/opl.2012.687 ◽

2012 ◽

Vol 1383 ◽

Author(s):

Xiaodong Mao ◽

Tae Kyu Kim ◽

Sung-Soo Kim ◽

Chang Hee Han ◽

Kyu Hwan Oh ◽

...

Keyword(s):

Hot Rolling ◽

Rolling Process ◽

Face Centered Cubic ◽

Metal Powders ◽

Heat Treated Sample ◽

Ods Steel ◽

Treated Sample ◽

The Matrix ◽

Oxide Particles ◽

Face Centered

ABSTRACT12Cr ODS steel samples were prepared by mechanical alloying of the metal powders with 20-30 nm Y2O3 particles followed by isostatic pressing, hot rolling and final heat treatment. Evolutions of oxide particles such as YTaO4 and YCrO3 after each fabrication step were investigated by using TEM with EDS. Crystallographic correlation between oxide particles and the matrix was investigated in a HIPped sample, and interactions between dislocations and oxide particles were observed in hot rolled or heat treated sample. Size distributions of oxide particles were measured by carbon replica samples and it was found that coarsening of oxide particles from 9 to 12 nm occurred during hot rolling process. Additional isothermal annealing at 1250 ˚C revealed that phase transformation of oxide particles from monoclinic YTaO4 to face centered cubic Y3TaO7 was observed.

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