Effect of electron irradiation on stability of oxides in 9Cr- ODS steel
WANG Hui1,2,YANG Zhan- bing1,2,YANG Su- bing1,2,LUO Ji3
（1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China 2. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China 3. Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China）
Abstract：Electron irradiation（e-irr.）was performed on 9Cr- ODS（oxide dispersion strengthened）ferritic- martensitic steels by using HVEM（high- voltage electron microscope）at 450, 500 and 550 ℃, and the change of Y- Ti- O nano- oxides′ appearance and component were observed and analyzed before and after irradiation. The effect of electron irradiation on the stability of nano- oxides was compared at different temperatures. The results showed that nano- oxides′ size was decreased in different degrees after electron irradiation at different temperatures. The diameter reducing ratio of nano- oxides after irradiation was 8.51%（450 ℃）, 19.38%（500 ℃）and 25.99%（550 ℃）, respectively, and the tendency of radiation- induced change of Cr concentration inside the oxide was also 550 ℃＞500 ℃＞450 ℃. The void swelling was suppressed by high dispersed nano- oxides under electron irradiation. Solute atoms on the nano- oxides left the original position to matrix because of the impact of high energy electronics and diffusion of point defects, which caused the decrease of nano- oxides’size. The diffusion rate of vacancy was enhanced with the increase of temperature, so as to accelerate the decrease of nano- oxides′ size. The irradiation injury behavior of nano- oxides in 9Cr- ODS steels under electron irradiation could be conducive to the exploration of oxides irradiation damage mechanism, and provide the basis for controlling irradiation damage phenomenon in 9Cr- ODS steels.
王会 ，杨占兵 ，杨苏冰 ，罗骥. 电子辐照对9Cr- ODS钢中氧化物稳定性的影响[J]. 中国冶金, 2018, 28(5): 23-27.
WANG Hui,,YANG Zhan- bing,,YANG Su- bing,,LUO Ji. Effect of electron irradiation on stability of oxides in 9Cr- ODS steel[J]. China Metallurgy, 2018, 28(5): 23-27.
2018, Vol. 28 
