Abstract
Oxide-dispersion strengthened (ODS) ferritic steels containing a high density of nanoscale oxides are good candidates for structural applications in future fusion power reactors. In this research, to study the effects of zirconium (Zr) addition on the thermal stability of the microstructure and tensile properties of ODS steels, two kinds of 15Cr-ODS ferritic steels with nominal compositions (wt.%) of Fe-15Cr-2W- 0.3Y2O3 and Fe-15Cr-2W-0.3Zr-0.3Y2O3 were produced by the mechanical alloying (MA) of premixed powders and then consolidated by hot isostatic pressing (HIP) techniques. Elevated-temperature annealing in the range of 1150 °C–1350 °C on the coarsening kinetics of nanoscale oxides and microstructural evolution with and without Zr were systematically investigated by means of transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD) techniques. Results showed that Zr addition could improve the coarsening resistance of the nanoscale oxides and grains during annealing treatment due to the formation of stable nm-scale trigonal-phase Y4Zr3O12 oxides. Tensile tests on the annealed-ODS steels showed that the ultimate tensile strength and yield strength of 15Cr-Zr-ODS steel were higher than those of 15Cr-ODS steel. It was considered that the excellent thermal stability and tensile properties of 15Cr-Zr-ODS steel were related with the refined microstructure.
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