Crystal Structure Evolution of the Cu-rich Nano Precipitates from bcc to 9R in Reactor Pressure Vessel Model Steel
来源期刊：Acta Metallurgica Sinica2013年第6期
论文作者：Liu FENG Bangxin ZHOU Jianchao PENG Junan WANG
文章页码：707 - 712
摘 要：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 C for 0.5 h and then water quenched followed by tempering at 660 C for 10 h and aging at 400 C 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.
Liu FENG1,2，Bangxin ZHOU1,3，Jianchao PENG1,3，Junan WANG1,3
1. Institute of Materials,Shanghai University2. Analysis and Testing Center,Shandong University of Technology3. Laboratory for Microstructures,Shanghai University
摘 要：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 C for 0.5 h and then water quenched followed by tempering at 660 C for 10 h and aging at 400 C 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.
关键词：
