CARBURISING PDF

Method[ edit ] Carburization of steel involves a heat treatment of the metallic surface using a source of carbon. The process depends primarily upon ambient gas composition and furnace temperature, which must be carefully controlled, as the heat may also impact the microstructure of the remainder of the material. For applications where great control over gas composition is desired, carburization may take place under very low pressures in a vacuum chamber. Plasma carburization is increasingly used to improve the surface characteristics such as wear, corrosion resistance, hardness , load-bearing capacity, in addition to quality-based variables of various metals, notably stainless steels. The process is environmentally friendly in comparison to gaseous or solid carburizing.

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Method[ edit ] Carburization of steel involves a heat treatment of the metallic surface using a source of carbon. The process depends primarily upon ambient gas composition and furnace temperature, which must be carefully controlled, as the heat may also impact the microstructure of the remainder of the material.

For applications where great control over gas composition is desired, carburization may take place under very low pressures in a vacuum chamber.

Plasma carburization is increasingly used to improve the surface characteristics such as wear, corrosion resistance, hardness , load-bearing capacity, in addition to quality-based variables of various metals, notably stainless steels. The process is environmentally friendly in comparison to gaseous or solid carburizing. It also provides an even treatment of components with complex geometry the plasma can penetrate into holes and tight gaps , making it very flexible in terms of component treatment.

The process of carburization works via the diffusion of carbon atoms into the surface layers of a metal. If the carbon remains in solid solution, the steel is then heat treated to harden it. Both of these mechanisms strengthen the surface of the metal, the former by forming pearlite or martensite, and the latter via the formation of carbides. Both of these materials are hard and resist abrasion.

In oxy-acetylene welding , a carburizing flame is one with little oxygen, which produces a sooty , lower-temperature flame. It is often used to anneal metal, making it more malleable and flexible during the welding process.

A main goal when producing carburized workpieces is to ensure maximum contact between the workpiece surface and the carbon-rich elements. In gas and liquid carburizing, the workpieces are often supported in mesh baskets or suspended by wire.

In pack carburizing, the workpiece and carbon are enclosed in a container to ensure that contact is maintained over as much surface area as possible. Pack carburizing containers are usually made of carbon steel coated with aluminum or heat-resisting nickel-chromium alloy and sealed at all openings with fire clay.

Hardening agents[ edit ] There are different types of elements or materials that can be used to perform this process, but these mainly consist of high carbon content material. A few typical hardening agents include carbon monoxide gas CO , sodium cyanide and barium carbonate , or hardwood charcoal. In gas carburizing, the CO is given off by propane or natural gas.

In pack carburizing, carbon monoxide is given off by coke or hardwood charcoal. Geometrical possibilities[ edit ] There are all sorts of workpieces that can be carburized, which means almost limitless possibilities for the shape of materials that can be carburized. However careful consideration should be given to materials that contain nonuniform or non-symmetric sections. Different cross sections may have different cooling rates which can cause excessive stresses in the material and result in breakage.

The amount of these changes varies based on the type of material that is used, the carburizing process that the material undergoes and the original size and shape of the work piece. However changes are small compared to heat-treating operations.

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Carburizing 101: Everything You Need to Know

Types of Carburising Pack Carburising In this process, components are packed in an environment with high carbon content. A reducing agent carbon monoxide is introduced when heated. Due to high temperature the carbon monoxide starts to release carbon to be diffuse into the steel surface. The materials are then hardened due to the carbon absorption.

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Carburizing

Download Now Definition - What does Carburizing mean? Carburizing is a procedure that hardens metal surfaces while letting the metal underneath remain soft. This leads to the formation of a thinner and harder layer of metal known as the surface case. Carburizing is typically performed after a part has been constructed to its final form. It can also help in making element contents harder, such as in the case of pattern welding.

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Types of Carburising

Contact Carburizing Everything You Need to Know Case hardening is a process which involves adding a hard, protective shell to the outside of an otherwise soft steel. One of the most sophisticated and common forms of case hardening is carburizing. This is a method which involves introducing steel items to carbon atoms. Read on!

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