Annealing effect on the microstructure and magnetic properties of 14%Cr-ODS ferritic steel

作者：Ding H L; Gao R; Zhang T^*; Wang X P; Fang Q F; Liu C S

来源：Fusion Engineering and Design, 2015, 100: 371-377.

DOI：10.1016/j.fusengdes.2015.06.149

• ODS-steel
• Annealing effect
• Microstructure
• Oxide particles
• Vickers microhardness
• Magnetic properties

The microstructure and magnetic properties of the 14%Cr oxide dispersion strengthened (ODS) ferritic steel fabricated by sol-gel and HIP method were investigated by annealing in vacuum for 2 h (at 300, 600, 800,950 and 1150 degrees C) and 50 h (at 600, 800, 950 and 1150 degrees C). Microstructure analysis shows that as the annealing temperature increases, the size of oxide nanoparticles becomes smaller and their dispersion in matrix becomes more homogeneous. Grain size remains stable when the annealing temperature is below 800 degrees C, while above 800 degrees C, grain size grows with the increasing annealing temperature and time. The Vickers microhardness and coercivity (H-C) display almost similar evolution trend with annealing temperature for 2 h and Sob. No obvious recrystallization appears after 1150 degrees C annealing, which indicates the high microstructural stability of 14%Cr-ODS ferritic steel. The possible mechanism for above behaviors is discussed in this paper.

• 出版日期2015-11
• 单位中国科学院