The Microstructure of Shock Wave-Processed 45 Steel

The projectile was driven to 2.34 km/s by using 20 mm diameter two-stage light gas gun and impacted with a target to deliver a shock wave into 45 steel sample material. The micro-hardness and micro-structure of the shock wave processed 45 steel were analyzed. The observed results indicate that twins of cemetite in pearlite and high density disloctions to selected zones show that there exist two phases in ferrite of shock wave-processed 45 steel; One is phase of ferrite, and the other remains to be identified latter.