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

Published online by Cambridge University Press:  12 April 2012

Xiaodong Mao
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Yuseong-gu, Daejeon 305-353, Republic of Korea Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
Tae Kyu Kim
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Yuseong-gu, Daejeon 305-353, Republic of Korea
Sung-Soo Kim
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Yuseong-gu, Daejeon 305-353, Republic of Korea
Chang Hee Han
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Yuseong-gu, Daejeon 305-353, Republic of Korea
Kyu Hwan Oh
Affiliation:
Department of Materials Science and Engineering, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea
Jinsung Jang
Affiliation:
Nuclear Materials Division, Korea Atomic Energy Research Institute, 989-111 Daedeok-daero Yuseong-gu, Daejeon 305-353, Republic of Korea
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Abstract

12Cr 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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2012

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References

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