The effect of Ti on the coarsening behavior of oxygen-rich nanoparticles in oxide-dispersion-strengthened steels after annealing at 1200 °C

Oxide-dispersion-strengthened (ODS) steels are candidate structural materials for future fusion reactors. For this application, the coarsening behavior of the yttria-based strengthening oxygen-rich nanoparticles is of particular importance. This paper reports on the coarsening behavior of oxygen-rich nanoparticles in two Fe-14Cr-2W-(0.1-0.3)Ti base alloys after annealing at 1200 degrees C up to 100 h. Nanoparticles with and without Ti enrichment are investigated, and it is shown that nanoparticles that do not contain Ti coarsen at the same rates as those with Ti. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.