초록 ▼

Austenitic stainless steels and nickel-base alloys containing, by wt. %, 0.1 to 3.0% V, 0.01 to 0.08% C, 0.01 to 0.5% N, 0.05% max. each of Al and Ti, and 0.005 to 0.10% O, are strengthened and ductility retained by atomization of a metal melt under cover of an inert gas with added oxygen to form ap

Austenitic stainless steels and nickel-base alloys containing, by wt. %, 0.1 to 3.0% V, 0.01 to 0.08% C, 0.01 to 0.5% N, 0.05% max. each of Al and Ti, and 0.005 to 0.10% O, are strengthened and ductility retained by atomization of a metal melt under cover of an inert gas with added oxygen to form approximately 8 nanometer-size hollow oxides within the alloy grains and, when the alloy is aged, strengthened by precipitation of carbides and nitrides nucleated by the hollow oxides. Added strengthening is achieved by nitrogen solid solution strengthening and by the effect of solid oxides precipitated along and pinning grain boundaries to provide temperature-stabilization and refinement of the alloy grains.

대표청구항 ▼

[ What is claimed is:] [1.] A method of producing austenitic stainless steels and nickel-base alloys of enhanced strength and retained ductility, comprising, under cover of an inert gas, forming an alloy melt containing from about 0.05 to about 3.0 wt. % vanadium, from about 0.01 to about 0.08 wt. %

[ What is claimed is:] [1.] A method of producing austenitic stainless steels and nickel-base alloys of enhanced strength and retained ductility, comprising, under cover of an inert gas, forming an alloy melt containing from about 0.05 to about 3.0 wt. % vanadium, from about 0.01 to about 0.08 wt. % carbon, from about 0.01 to about 0.5 wt. % nitrogen, about 0.05 max. wt. % each of aluminum and titanium, introducing sufficient oxygen into the atmosphere over the melt to provide about 0.005 to about 0.1 wt. % dissociated oxygen in the melt, and atomizing the melt to form a solid granular product containing a plurality of approximately 7-10 nanometer diameter hollow oxides inside the alloy grains.