Influence of Al addition on the microstructure and mechanical properties of Zr-containing 9Cr-ODS steel

Journal of Materials Research and Technology

Yongchang Liu¹  Dijun Long²  Liming Yu³  Jianjie Wang³  Zumin Wang³  Huijun Li³ 

[1] Corresponding author.;Science and Technology on Reactor Fuel and Materials Laboratory, Nuclear Power Institute of China, Chengdu, Sichuan, 610041, China;State Key Lab of Hydraulic Engineering Simulation and Safety, Tianjin Key Lab of Composite and Functional Materials, Tianjin University, Tianjin, 300072, China;

关键词: ODS steels;    Carbides;    Oxides;    Mechanical properties;   

DOI  :  

来源: DOAJ

【 摘 要 】

Two oxide dispersion strengthened (ODS) steels with compositions of 9Cr-ODS (9Cr-ODS) and 9Cr-3Al-ODS (9Cr-ODS-Al) were fabricated by hot isostatic pressing (HIP). The microstructures and precipitates of the ODS samples were characterized by scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM). The results showed that the addition of Al could reduce the precipitation of coarse M23C6 and optimized the size of carbides in ODS steels. Furthermore, it was found that the mean size of nanoparticles in 9Cr-ODS-Al is larger than that in 9Cr-ODS due to the formation of large-size Y–Al–O nanoparticles with Al addition. The tensile test results indicated that the addition of Al slightly decreased the strength of ODS steels, but substantially increased the ductility.

【 授权许可】

Unknown