Ren Jian, Yu Liming, Liu Yongchang, Liu Chenxi, Li Huijun, Wu Jiefeng
State Key Lab of Hydraulic Engineering Simulation and Saety, Tianjin Key Lab of Composite and Functional Materials, Tianjin University, Tianjin 300072, China.
Institute of Plasma Physics, Chinese Academy of Sciences, Hefei 230031, China.
Materials (Basel). 2018 Jan 12;11(1):118. doi: 10.3390/ma11010118.
Oxide dispersion strengthened (ODS) steels with different contents of zirconium (denoted as 16Cr ODS, 16Cr-0.3Zr ODS and 16Cr-0.6Zr ODS) were fabricated to investigate the effects of Zr on strengthening mechanism of Al-alloyed 16Cr ODS steel. Electron backscatter diffraction (EBSD) results show that the mean grain size of ODS steels could be decreased by Zr addition. Transmission electron microscope (TEM) results indicate that Zr addition could increase the number density but decrease the mean diameter and inter-particle spacing of oxide particles. Furthermore, it is also found that in addition to Y-Al-O nanoparticles, Y-Zr-O oxides with finer size were observed in 16Cr-0.3Zr ODS and 16Cr-0.6Zr ODS steels. These changes in microstructure significantly increase the yield strength (YS) and ultimate tensile strength (UTS) of ODS steels through mechanisms of grain boundary strengthening and dispersion strengthening.
制备了不同锆含量的氧化物弥散强化（ODS）钢（分别记为16Cr ODS、16Cr-0.3Zr ODS和16Cr-0.6Zr ODS），以研究Zr对含铝合金化16Cr ODS钢强化机制的影响。电子背散射衍射（EBSD）结果表明，添加Zr可降低ODS钢的平均晶粒尺寸。透射电子显微镜（TEM）结果表明，添加Zr可增加氧化物颗粒的数量密度，但降低其平均直径和颗粒间间距。此外，还发现在16Cr-0.3Zr ODS和16Cr-0.6Zr ODS钢中，除了Y-Al-O纳米颗粒外，还观察到尺寸更细小的Y-Zr-O氧化物。这些微观结构的变化通过晶界强化和弥散强化机制显著提高了ODS钢的屈服强度（YS）和抗拉强度（UTS）。
