Fracture Toughness Resistance and Mechanical Tensile Properties of Cold Rolled CuZn30 Brass Alloy

Abstract

The present work studies the effect of cold rolling on the mechanical tensile, hardness and fracture toughness properties of alpha brass alloy (CuZn30). The material was cold rolled at room temperature to different percentage 25%, 50% and 75%. The mechanical tensile properties of the specimens with different cold rolling percentage were established by monotonic tensile test along three directions (L: rolling direction, T: transversal direction and D: diagonal direction). Therefore, the micro hardness of the as received and cold rolled alloy was determined by micro Vickers hardness test. Furthermore, the fracture toughness resistance of the cold rolled and as received alloy was evaluated by ductile tearing test using central cracked panels (CCP) samples in two directions (L and T). Experimental results found that mechanical tensile property, micro hardness and fracture toughness of brass alloy CuZn30 were considerably influenced by cold rolling. When the cold rolling increases, the strength and hardness increase rapidly however the ductility and the toughness fracture resistance lower. That is linked to the increase of density dislocation during the cold rolling. The highest strength and fracture toughness were shown in the longitudinal direction in the studies alloy. But the maximum ductility was noticed in the transversal direction.