초록 ▼

A method is described for producing homogeneous wrought microstructure during equal channel angular extrusion of difficult-to-work high temperature alloys that exhibit a high degree of flow softening at hot-working temperatures, wherein flow non-uniformities are minimized by imparting an increment o

A method is described for producing homogeneous wrought microstructure during equal channel angular extrusion of difficult-to-work high temperature alloys that exhibit a high degree of flow softening at hot-working temperatures, wherein flow non-uniformities are minimized by imparting an increment of initial upset deformation to an alloy immediately preceding shear flow through the deformation zone.

대표청구항 ▼

[ We claim:] [1.] In a method for extruding metals and alloys by equal channel angular extrusion, an improvement for producing homogeneous wrought microstructure in difficult-to-work high temperature alloys, comprising the steps of:(a) providing an extrusion channel having an entry channel portion a

[ We claim:] [1.] In a method for extruding metals and alloys by equal channel angular extrusion, an improvement for producing homogeneous wrought microstructure in difficult-to-work high temperature alloys, comprising the steps of:(a) providing an extrusion channel having an entry channel portion and an exit channel portion, said entry channel portion and said exit channel portion having substantially identical cross-sectional areas and having the respective centerlines thereof disposed at a preselected angle, said extrusion channel defining a shear zone at the intersection of said entry channel portion and said exit channel portion;(b) providing a billet of alloy material for extrusion through said extrusion channel, said billet sized to define a loose fit within said entry channel portion of said extrusion channel; and(c) extruding said billet through said extrusion channel under preselected strain and strain rate whereby an increment of upsetting-type deformation is imparted to said billet near said shear zone.