Some Experiments on Dynamic and Quasi-Static Forging of Aluminum at Elevated Temperatures

Abstract

The paper describes the results of hot and warm forging tests on aluminum specimens, using a modified Hopkinson pressure-bar in which impact velocities up to 100 m/s could be obtained. The maximum energy available was 30000 Nm, but for the work described here 24000 Nm was used at an impact velocity of 90 m/s. A short description of the apparatus is given. A typical punch load/displacement curve is presented. A comparison is made with forging at very low speed, and the effect of impact velocity on die filling, forging load, microstructure and hardness of the forged components is assessed. Two components of different geometries were forged. Contrary to original expectations, all trials in the high-velocity forging of one component were unsuccessful.