Abstract. CuZn30, which is also called cartridge brass, is an alloy used commonly in the production of large-calibre round cartridge cases. They are usually produced via cupping of a disc and consecutive deep drawing steps to decrease the wall thickness, with an annealing process in between each step to restore formability. In this study the manufacturing of cartridge brass (CuZn30) tubes is conducted through the flow forming process. In order to evaluate the flow forming behaviour, the preforms are manufactured by machining the CuZn30 billets, then the flow forming processes is applied. Thereafter, different temperature ranges (350, 450, and 550ºC for 1 h) are applied to flow formed samples in order to determine the proper recrystallization annealing temperature. The obtained microstructures and the mechanical properties are studied and revealed that the flow forming process is successfully realized, and the microstructure of the material is mapped with respect to the subsequent heat treatment temperature for recrystallization. Spherical and new grains are precisely generated after recrystallization annealing at 450 and 550ºC, but only partial recrystallization is obtained at 350ºC.

Abstract. Flow forming is a cold deformation process in which hollow cylindrical or conical parts with different geometric configurations are produced using tools such as balls, rollers, or flow forming wheels on specialized mandrels. Because it enables the production of parts without any further modifications or with minimal modifications before their use in service, the process is categorized as an NSF technology (net-shape forming), and therefore the flow formed parts can be considered as a final product. The aim of this study is to investigate the microstructure and mechanical properties of a flow formed 6082 Al alloy, which was initially in W-temper condition. Hollow cylindrical preforms were first manufactured by machining, and subsequently solution heat treated and quenched. Then, the parts were flow formed with 3 different reduction ratios (45%, 55% and 65%) prior to aging at 177 °C for 8 h to achieve T8 temper condition. Microstructures of the flow formed parts were examined by an optical microscope, and hardness and tensile tests were conducted. The results revealed that increasing reduction ratio slightly decreases hardness and strength with almost constant ductility.