Characterization of the nature and morphology of coarse precipitation in various oxide dispersion strengthened steels

Oxide Dispersion Strengthened (ODS) steels are candidate materials for both fission and fusion nuclear reactors. In this study, the microstructure of ferritic (Fe-14Cr-1W) / martensitic (Fe-9Cr-1W) ODS has been characterized after two different processing routes: Hot Extrusion (HE) Isostatic Pressing (HIP). Transmission Kikuchi Diffraction (TKD) revealed presence Ti-rich precipitates on every specimen. They identified by X-Ray (XRD) as Ti(C,N) Ti-O (Ti2O3 or TiO2). Intergranular M7C3 M23C6 have observed most Fe-14Cr except one, where no Cr-carbides found. Fe-9Cr ODS, intergranular Cr-rich carbides The lack is possibly linked to matrix phase transformation, not occurring in ODS. display highly elongated shapes HE specimens that could be detrimental mechanical behavior material.