Controlled grain size for ODS iron-base alloys
AssigneeInco Alloys International, Inc.
InventorJohn H. Weber
Life of this patent
Estimating the term…
Abstract
The process of the invention relates to forming MA iron-base ODS alloys. A billet of iron-base ODS alloy is provided. The billet is consolidated at a temperature within a predetermined range of sufficient temperature for formation of coarse and/or fine grain sizes during a final heat treatment. The consolidated billet is worked into final form. The object is annealed to recrystallize grains to a size determined by the temperature of the consolidation and the working of the extruded billet.
Claims10
A method for production of mechanically alloyed iron-base ODS alloys in a manner which allows for flexibility in final grain size comprising:
- a) providing an iron-base ODS billet of mechanically alloyed iron-base ODS alloy powder,
- b) consolidating said billet within a predetermined temperature range above 1100.degree. C. of sufficient temperature to provide for formation of products having the final grain size ranging from fine to coarse following a final heat treatment,
- c) working said consolidated billet into an object of final form, and
- d) final annealing said object at a temperature of at least about 1340.degree. C. to recrystallize grains to the final grain size determined by said temperature of said consolidation and said working of said consolidated billet.
A method for production of mechanically alloyed iron-base ODS alloys in a manner which allows for flexibility in final grain size comprising:
- a) providing an iron-base ODS billet of mechanically alloyed iron-base ODS alloy powder, said iron-base ODS alloy containing by weight percent about 10 to 40% chromium and about 1 to 10% aluminum,
- b) consolidating said billet at a temperature between about 1121.degree. C. and 1232.degree. C. to provide for formation of products having the final grain size ranging from fine to coarse following a final heat treatment,
- c) reducing thickness of said billet at elevated temperature,
- d) cold rolling said consolidated billet into sheet to a final thickness, and
- e) final annealing said sheet at a temperature of about 1340.degree. C.-1400.degree. C. to recrystallize grains to the final grain size determined by said temperature of consolidation, said reducing and said rolling.
Dependencies are inferred from the claim text.