ODS ALLOY BY CVD COATED POWDERS

摘要

Reduced-activation, oxide dispersion strengthened (ODS) ferritic/martensitic steels are the primary candidates for first wall and blanket structural applications for future fusion reactors. However, current ODS steel manufacturing by mechanical alloying is not cost effective and yields anisotropic properties with bamboo-like grain structure. This project developed an innovative, CVD coated, nanoengineered ODS powders, along with their conversion to ODS ferritic steel by extrusion/rolling with eqiaxed grain structure. Ultimate Tensile Strength (UTS) up to 910MPa was achieved, with moderate elongation of 9% for CIP/extruded/rolled materials which is comparable with currently available MA 956 ferritic steel. New, higher strength, high temperature ferritic steels should have application to nuclear, fusion, and other power generation system construction. Additional applications include turbine engines, industrial heat treating furnace structures, and glass making equipment. The new fabrication route should enable more precise control over material microstructures.