Microstructure and Mechanical Properties of 14Cr-ODS Steels with Zr Addition

Abstract

In this study, oxide dispersion strengthened (ODS) ferritic steels with nominal composition of Fe-14Cr-2W-0.35Y 2 O 3 (14Cr non Zr-ODS) and Fe-14Cr-2W-0.3Zr-0.35Y 2 O 3 (14Cr-Zr-ODS) were fabricated by mechanical alloying (MA) and hot isostatic pressing (HIP) technique to explore the impact of Zr addition on the microstructure and mechanical properties of 14Cr-ODS steels. Microstructure characterization revealed that Zr addition led to the formation of finer oxides, which was identified as Y 4 Zr 3 O 12 , with denser dispersion in the matrix. The ultimate tensile strength (UTS) of the non Zr-ODS steel is about 1201 MPa, but UTS of the Zr-ODS steel increases to1372 MPa, indicating the enhancement of mechanical properties by Zr addition.