HYDRODYNAMIC COMPRESSIVE FORGING.
Final technical rept. 21 Jun 65-28 Nov 66,
TRW INC CLEVELAND OH
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The purpose of this program was to develop and demonstrate the utility of the hydrodynamic compressive forging technique as a useful industrial process. The three alloys Mo-TZMas-extruded and stress relieved, Inco 713C as-cast, and beryllium HP20 as hot pressed were investigated in this study over the temperature range from room temperature to 1000 F with dynamic back pressures from 0 to in excess of 150,000 psi. The results of three forging operations, upsetting, radial flanging and ring expansion, have demonstrated the following 1 Back pressure improves the reduction which can be achieved by upsetting the beryllium alloy HP20 at 500 F and 1000 F 2 The molybdenum alloy MO-TZM as-extruded and stress relieved can be successfully upset 75 percent over the temperature range studies without back pressure 3 Within the limits of the tooling design for this study the superalloy Inco 713C could not be successfully forged 4 No significant effects of back pressure were observed in flanging and ring expansion 5 Because of the high working pressures involved in this study tooling-workpiece contact friction strongly affected the success of the forging operation and the product shape 6 Radial flanging was limited to alloys possessing flow stresses less than 150,000 psi by the strength of the punch material 500,000 psi with no back pressure 7 For materials which can be strained to or beyond the strain at ultimate load the fiber strain achieved during ring expansion will not be improved by increased pressure.
- Fabrication Metallurgy