Microstructure Refinement and Strengthening Mechanisms of a 9Cr Oxide Dispersion Strengthened Steel by Zirconium Addition

摘要

To study the effects of zirconium (Zr) addition on the microstructure, hardness and the tensile properties of oxide dispersion strengthened (ODS) ferritic–martensitic steels, two kinds of 9Cr-ODS ferritic–martensitic steels with nominal compositions (wt.%) of Fe-9Cr-2W-0.3Y 2 O 3 and Fe-9Cr-2W-0.3Zr-0.3Y 2 O 3 were fabricated by the mechanical alloying (MA) of premixed powders and then consolidated by hot isostatic pressing (HIP) techniques. The experimental results showed that the average grain size decreases with Zr addition. The trigonal δ-phase Y 4 Zr 3 O 12 oxides and body-centered cubic Y 2 O 3 oxides are formed in the 9Cr-Zr-ODS steel and 9Cr non-Zr ODS steel, respectively, and the average size of Y 4 Zr 3 O 12 particles is much smaller than that of Y 2 O 3 . The dispersion morphology of the oxide particles in 9Cr-Zr-ODS steel is significantly improved and the number density is 1.1 × 10 23 /m 3 with Zr addition. The 9Cr-Zr-ODS steel shows much higher tensile ductility, ultimate tensile strength and Vickers hardness at the same time.