CARBURISING PDF

Gas Carburising Process is a surface chemistry process, which improves the case depth hardness of a component by diffusing carbon into the surface layer to improve wear and fatigue resistance. During the thermal cycle the components are subject to an enriched carbon atmosphere such that nascent species of carbon can diffuse into the surface layers of the component. The rate of diffusion is dependent on the alloy and carbon potential of the atmosphere. Care must be taken to ensure that only sufficient carbon is available in the atmosphere at any one time to satisfy the take up rate of the alloy to accept the carbon atoms. In practice, this is defined in a carbon potential setpoint profile which runs concurrently with the temperature cycle.

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Gas Carburising Process is a surface chemistry process, which improves the case depth hardness of a component by diffusing carbon into the surface layer to improve wear and fatigue resistance. During the thermal cycle the components are subject to an enriched carbon atmosphere such that nascent species of carbon can diffuse into the surface layers of the component. The rate of diffusion is dependent on the alloy and carbon potential of the atmosphere. Care must be taken to ensure that only sufficient carbon is available in the atmosphere at any one time to satisfy the take up rate of the alloy to accept the carbon atoms.

In practice, this is defined in a carbon potential setpoint profile which runs concurrently with the temperature cycle. The setpoint may give a boost phase where the carbon potential would be typically set above 1. Depending on the final requirement for effective case depth, the whole cycle may take many hours. Once the heating and carbon diffusion part of the process are complete it is necessary to rapidly quench the components to a defined alloy recipe.

The recipe will specify the quench method, the quenchant temperature and time. The purpose of the quench process is to provide the required hardness of the component by completing a Martensitic phase change in the alloy. Gas carburising and other surface chemistry treatments can be carried out in batch or continuous furnaces dependent on the parts under treatment and the user requirements.

Eurotherm provides heat treat control solutions for both types of furnaces, as well as other metal treating processes such as:. They are sent to your computer or device when you request a specific action or service, e. Thanks to statistical or analytical cookies, delivered by us and other companies, we can count the visits on our website and know the sources of traffic.

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Types of Carburising

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Carbonitriding / carburising

Carburising is a case hardening process that introduces carbon into a solid ferrous alloy. This is accomplished by heating the metal in a carbonaceous atmosphere above transformation temperature for a pre-determined time. Subsequent to carburising, parts are quenched to harden the surface carburising layer. The core remains unaffected. It is a widely used surface hardening process for low carbon steel. The industrial importance of carburising is expressed in its market share, as one third of all hardening heat treatment is covered by carburising and hardening. Carburising and quench produce hard surfaces which are resistant to wear.

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