How do metal composite materials “stick” together?
What are metal composite materials?
Metal composite materials refer to composite materials formed by metallurgical combination of two or more different metals. Commonly used are titanium steel composite, copper steel composite, titanium zinc composite, titanium nickel composite, nickel steel composite, copper aluminum composite, nickel copper composite, etc.
Since the respective advantages of the component materials can be used to achieve the optimal configuration of each component material resource, save precious metal materials, and achieve the performance requirements that a single metal cannot meet, metal composite materials have been widely used in more and more fields.
The first time you come into contact with metal composite materials, you will definitely have doubts. How do different metals “stick” together? There are several common metal composite methods. Let’s understand them together.
Explosive compound method
Using explosives as energy sources, different metals are welded together in a large area under the high-speed detonation and impact of explosives.
Rolling compound method
Under the action of the rolling force of the rolling mill, the surfaces of the two metals to be compounded are plastically deformed, which causes the surface of the metal to crack, and the fresh metals exposed from the cracks contact each other, and the metallurgical bond is formed between the metals under pressure. According to the temperature during rolling, the rolling compound method can be divided into hot rolling and cold rolling.
Hot-rolled composite method
At a certain temperature, the metal to be compounded is rolled by the rolling force of the rolling mill to form a metallurgical bond. Hot-rolled composite is the main method of producing composite plates. It has the advantages of simple process and high production efficiency, and can give full play to the rolling capacity of the rolling mill and the plastic deformation ability of the material at high temperature, and the bonding strength of the metal composite interface is high.
Cold rolling compound method
Cold-rolling compounding is developed on the basis of hot-rolling compounding. Due to the low rolling compounding temperature, it can avoid the phase transition and microstructure change that are not conducive to the combination of metal materials, and avoid the formation of brittle intermetallic compounds. The composite material produced by cold rolling has stable performance and can realize the rolling compound of a variety of materials, but the deformation rate of the base metal during the rolling process is as high as 60% to 70%.
Explosion-rolling compound method
The explosive-rolling composite method refers to the use of explosive composite technology to weld two or more metal plates that need to be composited according to a certain thickness ratio to make composite slabs, and then hot-rolled according to different conditions and requirements Or cold rolled into a composite board with the required thickness.
The powder metallurgy method is to spread the uniformly mixed metal powder on the surface of the base metal for pressing, then sinter it at a high temperature in a protective atmosphere, and finally make a composite material product through cutting.
Diffusion compound method
Diffusion composite method is to closely adhere two metals and maintain them for a period of time under a certain temperature and pressure, so that the atoms between the contact surfaces diffuse each other to form a metallurgical bond.
The centrifugal casting method is to pour molten alloy melt into a rotating base metal mold. Under the action of centrifugal force, the alloy melt adheres to the inner wall of the mold, and after rapid cooling and solidification, it is closely combined with the base metal.
Casting compound method
The casting compound method is to pre-treat the surface of the base metal and preheat it to a certain temperature, and then immerse it in a casting mold cavity filled with a layer of molten metal, or put the base metal into the casting mold cavity, and then cast the mold The cavity is cast with multiple layers of molten metal, and the liquid metal is solidified and cooled to form a composite material.
Continuous casting and rolling compound method
The continuous casting and rolling composite method combines the traditional casting method and the rolling method. The high-temperature molten metal is continuously cast on the surface of the base steel plate, so that the liquid metal and the solid base metal are continuously rolled on the rolling mill at the same time. The rolling force and the high temperature diffusion of the liquid metal make the two metals form a metallurgical bond.
Source: The World of Metal Materials
China Forged Flange Manufacturer – Yaang Pipe Industry (www.steeljrv.com)
(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)
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