Effect of tempering temperature on the forming properties of fragments of 50SiMnVB steel shell

In order to acquire the effects of different tempering temperatures on the forming properties of shell fragments, 50SiMnVB steel is used as shell material, and is tempered at 3 different temperatures. The forming velocity and mass distribution of 50SiMnVB steel shell fragments are researched through the initial velocity test and the fragment recovering well test, and the expanding and breaking processes of 50SiMnVB steel shell, and the variation rules of fragment velocity and fragment mass distribution are numerically simulated by using AUTODYN-3D finite element analysis software. The results shows that, with the increase in tempering temperature, the breaking degree of 50SiMnVB steel shell decreases and the total number of fragments reduces gradually, but the fragments which mass is more than 1.0 g increase gradually, which is increased by 77.4%; however, the tempering temperatures have less influence on the initial velocity of 50SiMnVB steel shell fragments.