A new method for preparing 9Cr-ODS steel using elemental yttrium and Fe2O3 oxygen carrier

Add time:08/05/2019    Source:sciencedirect.com

Casting oxide dispersion strengthened (ODS) steel is difficult due to the coarsening and agglomeration of oxide particles during melting and solidification. In the present paper, a new method was developed to prepare 9Cr-ODS steel via the in situ reaction between elemental yttrium in molten Fe and activated oxygen from Fe2O3 oxygen carrier. To identify whether coarsening and aggregation of yttrium oxides can be suppressed, the cast steels did not suffer plastic deformation. Finally, tempered martensite matrix was obtained accompanied with about 0.2–1.1 μm yttrium oxides. Some yttrium oxides suffered coarsening and agglomeration due to the high oxygen content. 9Cr-ODS steel exhibited higher ultimate tensile strength, yield strength and slight lower elongation compared to 9Cr steel. The results indicated that yttrium oxides could be effectively introduced into the steel matrix via this casting method, which provided an alternative method for ODS steel fabrication.

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