HYDRODYNAMIC COMPRESSIVE FORGING.
Abstract
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-TZM(as-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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1967
- Accession Number
- AD0808985
Entities
People
- A. L. Hoffmanner
- L. R. Kupfer