Constant energy rate forming
AssigneeUnited Technologies Corporation
InventorsAnthony F. Giamei, Robert E. Doiron
Life of this patent
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Abstract
An improved method for hot working materials previously considered to be difficult or impossible to hot work is described. The method consists of varying the deformation conditions in order to achieve an essentially constant energy input, to the material being worked, on a time basis.
Claims6
A method for hot working materials selected from the group consisting of iron base superalloys, nickel base superalloys, cobalt base superalloys, titanium alloys, tool steels and refractory metals, which comprises hot working the material using dies which have been heated to the working temperature using a deformation rate which is adjusted so that the energy input the workpiece is substantially constant with respect to time.
In a method for hot working nickel base superalloy articles which comprises hot working the articles using dies which have been heated to the working temperature at a constant strain rate for an initial amount of from about 0.2 to about 10% strain and subsequently working the articles under conditions of constant energy input.
In an apparatus for hot working metal articles, the improvement which comprises stress sensing means, strain sensing means, and control means which integrate the prior stress and strain history of the material and controls this subsequent working of the material so that said subsequent working occurs under condition of constant energy input to the article.
Dependencies are inferred from the claim text.