1 Products Description
In order to maximize the performance of metal materials, one of the methods is to combine materials with different properties to make composite materials. copper clad steel ASTM c11000 (base layer is steel, and cladding layer is copper or copper alloy) has broad application prospects in the military industry, electronics, coinage, cooking utensils, and architectural decoration due to its advantages of corrosion resistance, abrasion resistance, excellent conductivity and thermal conductivity, beauty, and low cost. In addition, due to the excellent performance of both copper and steel, copper/steel composite materials are also widely used in other fields, such as in the automotive industry, using copper/steel composite materials to manufacture heat exchangers, synchronizer cone rings, reducer worm gears, bearing shells, etc; In the metallurgical industry, copper/steel composites are used as electrodes for electroplating technology, etc.
2 Mechanical property inspection of test plate
After the explosives with stable detonation distance have been prepared, the process test of small test plates is carried out to test the detonation distance of explosives and the bonding strength of composite plates. Small test panel specification 6.5 × one hundred and three × 1555/21~22 × one hundred × 1540mm After the surface treatment of the base clad plate of the small test plate and the clearance of the base plate, the base clad plate shall be explosively compounded. The explosively compounded process parameters of the small plate composite are shown in table 1.
After the small plate explodes and recombines, the U-test is carried out, and the result is 100% combined, and then the stress relief annealing treatment is carried out. The heat treatment system is as follows: the box-type resistance furnace is heated, the temperature rises with the furnace, 500 ± 10 ℃/3h, and the furnace is cooled to<300 ℃, and the furnace is cooled to air cooling.
3Metallographic analysis of the interface of the test plate
Conduct metallographic observation on the transverse and longitudinal directions of the sample, as shown in Figure 2. From the metallographic photos of the longitudinal and transverse specimens in Figure 2, it can be seen that the bonding interface of the c11000/A36 composite plate is the characteristic wavy interface of explosive bonding. This is because, under the action of explosive detonation energy, the copper plate collides with the steel plate instantaneously at a certain tilt angle, and realizes metallurgical bonding under the action of high temperature and high pressure, and its interface is early wavy bonding. It can be clearly seen at the joint interface that there is a vortex at the front part of the wave. The particles in the base layer of the vortex are broken, and the particles are relatively small, and the explosive hardening phenomenon occurs at the interface.
4 SEM analysis of bonding interface of test plate
Scanning electron microscope analysis was performed on the bonding interface of the copper clad steel astm c11000 plate, as shown in Figure 3. It can be seen from the figure that there is no new phase near the interface. The ED-energy spectrum analysis of the area near the steel side interface shows that there are both Cu and Fe elements in this area. It is obvious that the base and clad elements have diffused. However, because the clad plate is metallurgical bonding at the moment of explosion, the distance of element diffusion is very short, and a small amount of brittle compounds are formed at the interface, which has no effect on the properties of the clad plate.
5 Preparation of large area composite plate
After the process test of the small test panel, the mechanical property results show that the explosives and heat treatment technology used in the process test of the small test panel are completely suitable, so the process parameters are applied to the preparation of the large plate, that is, the large plate is explosively compounded. The composite finished product meets the process design requirements.
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