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Title: Effect of Minor Alloying Element on Dispersing Nano-particles in ODS Steel

Abstract

From the irradiation resistance and high-temperature strength, oxide dispersion strengthened (ODS) ferritic steels are candidate materials for advanced and fusion reactors. For the development of advanced steels the key issue is to homogenize nano-particles into matrix. Recent studies have indicated that Ti addition can homogenize Y-Ti complex particles into ferrite matrix, but the reason of the effect of additional elements has not been clarified. In this model study, we focus on the effect of additional elements, such as IV and V families and other oxide formers, which can control potentially the distribution of the oxide particles. The materials used in this study were based on Fe-9Cr-Y{sub 2}O{sub 3} alloys which were mechanical alloyed (MA) from the powder of Fe, Cr and Y{sub 2}O{sub 3}, which was added systematically with the element of Ti, Zr, Ta, V, Nb, Hf, Al, Si and others. Usually ODS fabrication process is required for hot extrusion, but we annealed up to 1150 C for simplify the microstructure. To evaluate the distribution of ODS particles; we used TEM equipped with EDS after electro-polishing or FIB techniques. (1) In the case of Si or Al addition, oxides were disappeared after MA process, which means Y{sub 2}O{sub 3}more » and other elements should be in solution at non-equilibrium condition. Two types of oxides of Y{sub 2}O{sub 3} and Al{sub 2}O{sub 3} or SiO{sub 2} developed after the annealing at 850 C, but only complex oxides were developed after the annealing at 1150 C. This result suggests that the oxide formation is independent process for Y and Si or Al. (2) In the case of Ti addition, oxides also were disappeared after MA process, but developed after annealing at 1150 C. This means that Ti can stabilize complex oxides of Y and Ti, and enhance the fine distribution of the oxides comparing with simple Fe-9Cr-Y{sub 2}O{sub 3} alloy. (authors)« less

Authors:
; ; ; ; ; ;  [1]; ; ; ;  [2]
  1. Grad. School of Engineering, Hokkaido University, Sapporo, Hokkaido (Japan)
  2. Oarai-research center, JAEA, Oarai, Ibataki (Japan)
Publication Date:
Research Org.:
Materials Research Society, 506 Keystone Drive, Warrendale, PA, 15086-7573 (United States)
OSTI Identifier:
21091574
Resource Type:
Conference
Resource Relation:
Conference: Symposium on Structural and Refractory Materials for Fusion and Fission Technologies, Boston, MA (United States), 28-30 Nov 2006; Other Information: Country of input: France; Related Information: In: Proceedings of the Symposium on Structural and Refractory Materials for Fusion and Fission Technologies, by Aktaa, J. [ed. Forschungszentrum Karlsruhe GmbH, Institute for Materials Research II, Postfach 3640, 76021 Karlsruhe (Germany)]; Samaras, M. [ed. Paul Scherrer Institute, Nuclear Energy and Safety, CH-5232 Villigen PSI (Switzerland)]; Serrano de Caro, M. [ed. Lawrence Livermore National Laboratory, Chemical Biology and Nuclear Science Division, L-632, P.O. Box 808, Livermore, CA 94550 (United States)]; Victoria, M. [ed. Polytechnic University of Madrid, Instituto de Fusion Nuclear, J. Gutierrez Abascal 2, 28006 Madrid (Spain)]; Wirth, B. [ed. University of California-Berkeley, Nuclear Engineering Dept., Berkeley, CA 94720-1730 (United States)], v. 981E, 112 pages.
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ALUMINIUM OXIDES; ANNEALING; EXTRUSION; FERRITIC STEELS; IRRADIATION; NANOSTRUCTURES; PARTICLES; SILICON OXIDES; TEMPERATURE RANGE 1000-4000 K; TITANIUM ADDITIONS; TRANSMISSION ELECTRON MICROSCOPY; YTTRIUM ADDITIONS; YTTRIUM OXIDES

Citation Formats

Uchida, Y, Ohnuki, S, Hashimoto, N, Suda, T, Nagai, T, Shibayama, T, Hamada, K, Akasaka, N, Yamashita, S, Ohstuka, S, and Yoshitake, T. Effect of Minor Alloying Element on Dispersing Nano-particles in ODS Steel. United States: N. p., 2008. Web.
Uchida, Y, Ohnuki, S, Hashimoto, N, Suda, T, Nagai, T, Shibayama, T, Hamada, K, Akasaka, N, Yamashita, S, Ohstuka, S, & Yoshitake, T. Effect of Minor Alloying Element on Dispersing Nano-particles in ODS Steel. United States.
Uchida, Y, Ohnuki, S, Hashimoto, N, Suda, T, Nagai, T, Shibayama, T, Hamada, K, Akasaka, N, Yamashita, S, Ohstuka, S, and Yoshitake, T. 2008. "Effect of Minor Alloying Element on Dispersing Nano-particles in ODS Steel". United States.
@article{osti_21091574,
title = {Effect of Minor Alloying Element on Dispersing Nano-particles in ODS Steel},
author = {Uchida, Y and Ohnuki, S and Hashimoto, N and Suda, T and Nagai, T and Shibayama, T and Hamada, K and Akasaka, N and Yamashita, S and Ohstuka, S and Yoshitake, T},
abstractNote = {From the irradiation resistance and high-temperature strength, oxide dispersion strengthened (ODS) ferritic steels are candidate materials for advanced and fusion reactors. For the development of advanced steels the key issue is to homogenize nano-particles into matrix. Recent studies have indicated that Ti addition can homogenize Y-Ti complex particles into ferrite matrix, but the reason of the effect of additional elements has not been clarified. In this model study, we focus on the effect of additional elements, such as IV and V families and other oxide formers, which can control potentially the distribution of the oxide particles. The materials used in this study were based on Fe-9Cr-Y{sub 2}O{sub 3} alloys which were mechanical alloyed (MA) from the powder of Fe, Cr and Y{sub 2}O{sub 3}, which was added systematically with the element of Ti, Zr, Ta, V, Nb, Hf, Al, Si and others. Usually ODS fabrication process is required for hot extrusion, but we annealed up to 1150 C for simplify the microstructure. To evaluate the distribution of ODS particles; we used TEM equipped with EDS after electro-polishing or FIB techniques. (1) In the case of Si or Al addition, oxides were disappeared after MA process, which means Y{sub 2}O{sub 3} and other elements should be in solution at non-equilibrium condition. Two types of oxides of Y{sub 2}O{sub 3} and Al{sub 2}O{sub 3} or SiO{sub 2} developed after the annealing at 850 C, but only complex oxides were developed after the annealing at 1150 C. This result suggests that the oxide formation is independent process for Y and Si or Al. (2) In the case of Ti addition, oxides also were disappeared after MA process, but developed after annealing at 1150 C. This means that Ti can stabilize complex oxides of Y and Ti, and enhance the fine distribution of the oxides comparing with simple Fe-9Cr-Y{sub 2}O{sub 3} alloy. (authors)},
doi = {},
url = {https://www.osti.gov/biblio/21091574}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2008},
month = {7}
}

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