Computer Simulation of the Forging of Fine Grain IN-718 Alloy

In recent years there has been great emphasis on the use of computer-aided tools in process design. The key to the success of any computer modeling is the accurate knowledge of the mechanical and thermal properties of the various components of a manufacturing system. In order to develop a data base of forging properties of IN-718, isothermal constant strain rate compression tests were conducted on the annealed fine grain material over the temperature range 871°C to 1149°C (16000°F to 21000°F) and strain rate range 0.001 sec-1 to 10 sec-1. Constitutive equations developed from the results of these tests, along with experimentally measured heat transfer and friction coefficients were used in the program ALPID to simulate non-isothermal forging of double wedge specimens. The simulation results were compared with actual forging in an industrial forge press. The good agreement between simulation and forging results indicates that when an accurate and complete data base of materials properties is available, computer modeling can be used effectively to study forging