Fabrication of three layer CU/ST304L/CU sheet by CRB and eva‎luation of mechanical properties and forming limit

9/19/2024 12:00:00 AM

Recently, researchers have paid attention to the investigation of the production methods of multi-layer metal composites. Among them, copper and steel are the most widely used and have various uses in various industries. At first, the main goal of this research was the feasibility of making a three-layer composite with a cold roll bonding process of metal copper/low carbon steel/copper sheets. In the first stage, the three-layer composite was successfully produced. In the second step, to check the mechanical, microstructural and formability properties of the samples, they were placed in four temperature conditions including: ambient temperature, 450, 600, 750 degrees Celsius for two hours. Forming limit curve (FLD) was used and eva‎luated as a suitable tool and criterion to determine the formability of sheets. The metal sheets in this composite showed 80% increase in length, 20% increase in width and 66% decrease in thickness after a rolling pass. In terms of mechanical properties, it had the highest amount of microhardness and high strength at ambient temperature. Among the annealed samples, the sample corresponding to the temperature of 450°C has the highest tensile strength and the lowest formability, and the sample annealed at 750°C shows the lowest microhardness value, the lowest tensile strength, and the highest formability. The annealing sample corresponding to the temperature of 600 °C has an intermediate behavior between these two temperatures. The results show that as the temperature increases, the plasticity of the samples increases, but the microhardness and strength of the material decreases compared to the ambient temperature. In the examination of the fracture cross-section and their microstructure, it was shown with a scanning electron microscope، that in ambient temperature samples and annealed at low temperature, the number of pores created is less and increases as the temperature of the annealed sample increases. The amount of pores created in the structure also increases.

تغيير شكل شديد پلاستيك، نورد پيوندي سرد، خواص مكانيكي، ريز ساختار، منحني حد شكل دهي، كامپوزيت سه لايه، مس/ استيل كم كربن / مس

Severe Plastic deformation, cold roll bonding, Formability limit curve, mechanical properties, three-layer composite, copper/low carbon steel/copper

Seyed Mohamadali Mortazavi moghadam

ramin hashemi