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http://dx.doi.org/10.5516/NET.02.2013.529

EFFECTS OF HEAT TREATMENTS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF DUAL PHASE ODS STEELS FOR HIGH TEMPERATURE STRENGTH  

Noh, Sanghoon (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Choi, Byoung-Kwon (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Han, Chang-Hee (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Kang, Suk Hoon (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Jang, Jinsung (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Jeong, Yong-Hwan (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Kim, Tae Kyu (Nuclear Materials Division, Korea Atomic Energy Research Institute)
Publication Information
Nuclear Engineering and Technology / v.45, no.6, 2013 , pp. 821-826 More about this Journal
Abstract
In the present study, the effects of various heat treatments on the microstructure and mechanical properties of dual phase ODS steels were investigated to enhance the high strength at elevated temperature. Dual phase ODS steels have been designed by the control of ferrite and austenite formers, i.e., Cr, W and Ni, C in Fe-based alloys. The ODS steels were fabricated by mechanical alloying and a hot isostatic pressing process. Heat treatments, including hot rolling-tempering and normalizing-tempering with air- and furnace-cooling, were carefully carried out. It was revealed that the grain size and oxide distributions of the ODS steels can be changed by heat treatment, which significantly affected the strengths at elevated temperature. Therefore, the high temperature strength of dual phase ODS steel can be enhanced by a proper heat treatment process with a good combination of ferrite grains, nano-oxide particles, and grain boundary sliding.
Keywords
Oxide Dispersion Strengthened Steel; Dual Phase; Microstructure; Tensile Properties; Grain Morphology; Oxide Particle; Heat Treatment;
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1 H.S. Cho, H. Ohkubo, N. Iwata, A. Kimura, S. Ukai, and M. Fujiwara, "Improvement of compatibility of advanced ferritic steels with super critical pressurized water toward a higher thermally efficient water-cooled blanket system," Fusion Eng. Design, vol. 81, pp. 1071-1076 (2006).   DOI   ScienceOn
2 Y. Yamashita, N. Akasaka, S. Ukai, and S. Ohnuki, "Microstructural development of a heavily neutron-irradiated ODS ferritic steel (MA957) at elevated temperature," J. Nucl. Mater., vol. 367-370, pp. 202-207 (2007).   DOI   ScienceOn
3 S. Ohtsuka, S. Ukai, H. Sakasegawa, M. Fujiwara, T. Kaito, and T. Narita, "Nano-mesoscopic structural characteriazation of 9Cr-ODS martensitic steel for improving creep strength," J. Nucl. Mater., vol. 367-370, pp. 160-165 (2007).   DOI   ScienceOn
4 A.T. Price, "Rupture ductility of creep resistant steels," The Inst. of Metals, London, Book No.522, p. 246 (1991).
5 S. Ohtsuka, S. Ukai , M. Fujiwara, and T. Kaito, T. Narita, "Improvement of creep strength of 9Cr-ODS martensitic steel by controlling excess oxygen and titanium concentration," Mater. Trans., vol. 46(3), pp. 487-492 (2005).   DOI   ScienceOn
6 S. Kim, S. Ohtsuka, T. Kaito, S. Yamashita, M. Inoue, T. Asayama, and T. Shobu, "Formation of nano-oxide particles and ${\delta}$-ferritie at elevated temperature in 9Cr-ODS steel," J. Nucl. Mater., vol. 417, pp. 209-212 (2011).   DOI   ScienceOn
7 M. Yamamoto, S. Ukai, S. Hayashi, T. Kaito, and S. Ohtsuka, "Reverse phase transformation form ${\alpha}$ to ${\gamma}$ in 9Cr-ODS ferritic steels," J. Nucl. Mater., vol. 417, pp. 237-240 (2011).   DOI   ScienceOn
8 M.J. Alinger, G.R. Odette, and D.T. Hoelzer, "The development and stability of Y-Ti-O nanoclusters in mechanical alloyed Fe-Cr based ferritic alloys," J. Nucl. Mater., vol. 329-333, pp. 382-386 (2004).   DOI   ScienceOn
9 Y. Yazawa, T. Furuhara, and T. Maki, "Effect of matrix recrystallization on morphology, crystallography and coarsening behavior of vanadium carbide in austenite," Acta Metall., vol. 52, pp. 3727-3736 (2004).
10 S. Ukai, S. Ohtsuka, T. Kaito, H. Sakasegawa, N. Chikata, S. Hayashi, and S. Ohnuki, "High-temperature strength characterization of advanced 9Cr-ODS ferritic steels," Mater. Sci. Eng. A, vol. 510-511, pp. 115-120 (2009).   DOI   ScienceOn
11 S. Ukai, T. Okuda, M. Fujiwara, T. Kobayashi, S. Mizuta, and H. Nakashima, "Characterization of High Temperature Creep Properties in Recrystallized 12Cr-ODS Ferritic Steel Claddings," J. Nucl. Sci. Technol., vol. 39, pp. 872-879 (2002).   DOI