Strengthening of metallic alloys with nanometer-size oxide dispersions
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. 20 figs.
- Sponsoring Organization:
- DOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC07-94ID13223
- Assignee:
- Lockheed Martin Idaho Technologies Co., Idaho Falls, ID (United States)
- Patent Number(s):
- US 5908486; A
- Application Number:
- PPN: US 8-638080
- OSTI ID:
- 6201401
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CARBON ADDITIONS
DUCTILITY
GRAIN REFINEMENT
HARDENING
HIGH ALLOY STEELS
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
NICKEL ALLOYS
NICKEL BASE ALLOYS
NITROGEN ADDITIONS
OXYGEN ADDITIONS
PRECIPITATION HARDENING
STAINLESS STEELS
STEELS
TENSILE PROPERTIES
TITANIUM ADDITIONS
TITANIUM ALLOYS
VANADIUM ALLOYS