Crystal Structure Evolution of the Cu-rich Nano Precipitates from bcc to 9R in Reactor Pressure Vessel Model Steel

doi:10.1007/s40195-013-0170-4

Acta Metallurgica Sinica (English Letters)

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Crystal Structure Evolution of the Cu-rich Nano Precipitates from bcc to 9R in Reactor Pressure Vessel Model Steel

Liu FENG^1,2), Bangxin ZHOU^1,3), Jianchao PENG^1,3), Junan WANG^1,3)

1) Institute of Materials, Shanghai University, Shanghai 200072, China
2) Analysis and Testing Center, Shandong University of Technology, Zibo 255049,China
3) Laboratory for Microstructures, Shanghai University, Shanghai 200444, China

Received:2013-03-26 Revised:2013-07-01 Online:2013-12-25 Published:2014-02-28
Contact: Bangxin ZHOU
Supported by:
National Basic Research Program of China (No. 2011CB610503), the National Natural Science Foundation of China (No.50931003) and Ministry of Major Subject of Shanghai (No.S30107)

Abstract

Abstract:

The crystal structure evolution of the Cu-rich nano precipitates from bcc to 9R during thermal aging was studied in nuclear reactor pressure vessel (RPV) model steels. The specimens, contained higher copper and nickel contents than commercially available one, were heated at 890℃ for 0.5 h and then water quenched followed by tempering at 660℃ for 10 h and aging at 400℃ for 1000 h. It was observed that bcc and 9R orthogonal structure, as well as 9R orthogonal and 9R monoclinic structure, coexist in a single Cu-rich nano precipitate. Further analyses pointed out that Cu-rich nano precipitates of bcc structure were not stable, it may preferentially transform to 9R orthogonal structure and then to 9R monoclinic structure. This results showed that the crystal structure evolution of the Cu-rich nano precipitates was complex.

Key words: Reactor pressure vessel model steel, Thermal aging, Cu-rich nano Precipitates, Structure evolution, HRTEM

Liu FENG, Bangxin ZHOU, Jianchao PENG, Junan WANG. Crystal Structure Evolution of the Cu-rich Nano Precipitates from bcc to 9R in Reactor Pressure Vessel Model Steel[J]. Acta Metallurgica Sinica (English Letters), DOI: 10.1007/s40195-013-0170-4.

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Crystal Structure Evolution of the Cu-rich Nano Precipitates from bcc to 9R in Reactor Pressure Vessel Model Steel

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