Effect of Microstructure on the High Temperature Tensile Properties of Fe-17 percent Cr Nano-Sized Oxide Dispersion Strengthened Ferritic Alloy

摘要

In the past few years, oxide dispersion strengthened(ODS) alloys produced by mechanical alloying(MA) techniques have become increasingly interesting for structure applications in nuclear fission and fusion power plant. The mechanical properties of ferritic 17 percent Cr ODS alloys with and without the addition of Ti and Mo and 17 percent Cr ODS were investigated and comparison with those MA-956 alloys in the temperature range of 973K to 1573K. Nanosized oxide dispersoids in the 17Cr-3Mo-1Ti-0.25Y_2O_3 alloys suppressed the grain growth during annealing at high temperature and resulted in a remarkable improvement of the high temperature strength. The oxides containing Ti was the finest and showed the most uniform dispersion.