On the Destructive Behavior of Carbon Steel Forgings Due to Impact Bending (I)

Abstract

To study of the behaviors of destruction of carbon steel forgings at impact bending, we have designed the impact testing machine of drop hammer type. The drop hammer fell freely without any initial velocity. The ratio out put/input of the amplifier used was 100% through the range of frequency 100∼20000 c/s. In order to study the effect of forging direction on the behaviors of destruction of S55C forgings by impact bending five kinds of test pieces were prepared from forgings. According to our experiments, the directionality of forgings at the impact bending was remarkably strong, compared with the directionality at the static bending. The behaviors of normalized test pieces were superior in the resistance to impact bending to the behaviors of annealed test pieces. The forging directionality by impact bending was diminished by normalizing of test pieces.