Author/Authors :
de Castro، نويسنده , , V. and Leguey، نويسنده , , T. and Muٌoz، نويسنده , , A. S. Monge، نويسنده , , M.A. and Pareja، نويسنده , , R. W. Marquis، نويسنده , , E.A. and Lozano-Perez، نويسنده , , S. and Jenkins، نويسنده , , M.L.، نويسنده ,
Abstract :
Two Fe–12 wt% Cr alloys, one containing 0.4 wt% Y2O3 and the other Y2O3-free, have been produced by mechanical alloying followed by hot isostatic pressing. These oxide dispersion strengthened and reference alloys were characterized both in the as-HIPed state and after tempering by transmission electron microscopy and atom-probe tomography. The as-HIPed alloys exhibited the characteristic microstructure of lath martensite and contained a high density of dislocations. Small voids with sizes <10 nm were also observed. Both alloys also contained M3C and M23C6 carbides (M = Cr, Fe) probably as a result of C ingress during milling. After tempering at 1023 K for 4 h the microstructures had partially recovered. In the recovered regions, martensite laths were replaced by equiaxed grains in which M23C6 carbides decorated the grain boundaries. In the ODS alloy nanoparticles containing Y were commonly observed within grains, although they were also present at grain boundaries and adjacent to large carbides.
