Strengthening of metallic alloys with nanometer-size oxide dispe

Details Strengthening of metallic alloys with nanometer-size oxide dispe Strengthening of metallic alloys with nanometer-size oxide dispe

1996-04-26

1999-06-01

Mai, Ngoclan

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75246, 75352, 75355, 75252, 148207, 148513, 148514, C22C 3800, C22C 1903

Patent

active

059084863

ABSTRACT:
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.

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