C11000 Copper Clad Steel Plate For Chemical Industry

Use the wire cutting machine to cut several samples on the c11000 copper clad steel plate for chemical industry , with the sample size of 16mm × 10mm × 10mm, first put each group of samples in the ZDXS5 box-type resistance furnace for heating and heat preservation at different temperatures, and then grind the surface of each sample to be smooth and use the TD-3500 X-ray diffractometer for XRD analysis to determine the compound at the interface. Then grind and polish the metallography. The copper side and steel side are corroded with FeC13 hydrochloric acid alcohol solution and 4% nitric acid alcohol solution respectively, and the metallography is observed by VHX-2000 ultra-depth of field. The diffusion layer and energy spectrum of the interface micro-area were analyzed by scanning electron microscope (with EDS). Finally, the hardness distribution near the bonding interface of the sample was measured by HV-1000B microhardness tester.

 

The interface morphology of explosive welding bonding is shown in Figure 2. It can be seen that the bonding interface of copper/steel explosive welding composite plate is continuous and regular, with a wavelength of about 950 μ m. The wave height is about 300 μ m. This is also the interface feature that explosive welding is obviously different from other welding methods, which is mainly formed by the propagation of detonation wave generated after explosive explosion. Because the impact pressure far exceeds its dynamic yield strength, and finally forms a wavy bonding interface under the action of explosive products; Moreover, the wavy bonding interface increases the bonding area of copper and steel, which is beneficial to improve the bonding strength. At the same time, it is also observed that there are discontinuous metal melting lumps on the interface, which is because most of the energy generated by explosives is converted into heat energy, which will inevitably lead to metal melting under the condition of near adiabatic.

By observing the microstructure at the interface, it can be concluded that there is plastic deformation at both the steel side and the copper side. This plastic deformation is generated simultaneously with the formation of waves, and the closer to the interface, the greater the degree of plastic deformation. However, the difference is that the microstructure grain on the copper side is elongated and parallel to the impact direction (Fig. 3), which is because the copper with good plasticity deforms strongly under the action of huge pressure, forming dense streamline; No grain elongation is found on the steel side, but the grain size is obviously smaller than that far away from the interface (Fig. 4). This is because: during the welding process, the temperature rises sharply, and the metal melts and then rapidly cools to refine the grain; The severe plastic deformation at the interface destroyed the original grain, and recrystallized and refined the grain.