HYDRODYNAMIC COMPRESSIVE FORGING.
Final rept. for 9 Jul 62-1 Jul 64,
GENERAL ELECTRIC CO WEST LYNN MASS
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A manufacturing process development for the production of closed die forgings using hydrodynamic compressive forces at room temperatures is described. Upsetting materials in a cavity first filled with a low strength matrix increases the amount of plastic deformation obtained prior to fracture. The forces necessary to deform materials in this manner can be predicted from the extrusion force required for operation plus what is necessary to overcome the hydrostatic pressure developed by the resistance of the matrix to flow. The materials worked in this program were a low alloy carbon steel, AISI-4340 a cast nickel base high temperature alloy, SEL-15 an iron base face centered cubic precipitation hardening alloy, A-286 an iron base martensite precipitation hardening alloy, AM-355 a hexagonal close pack anisotropic alloy, 6A1-4V titanium and a body centered cubic refractory alloy, .5Ti molybdenum. Micro and macro examinations of the materials showed the parts produced in this manner to be structurally comparable to conventional cold worked metals. A modification of this method using a doughnut shaped billet filled with a matrix material reduced the die loading stresses. As a consequence, higher strength materials were worked in this manner. Author