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Determination of Carburizing Heat Treatment Process Parameters

Carburizing heat treatment is a kind of metal surface treatment. The method is to place the workpiece in an active carburizing medium and heat it to the single-phase austenite zone for carburizing heat treatment. Carburizing heat treatment can make the surface of the carburized workpiece obtain high hardness, while maintaining the original hardness and good toughness of the core.

Carburizing heat treatment is a chemical heat treatment, and the state of chemical heat treatment is determined by the chemical site concentration of the infiltrating element in the atmosphere and the metal. The chemical potential concentration of the infiltrated carbon element is discontinuous at the surface of the workpiece, that is, at the boundary, and there is a certain concentration gradient inside the metal. This process belongs to mixed control.

At the initial stage of carburizing heat treatment, the carbon concentration on the surface of the workpiece is lower than the carbon potential concentration, while the carbon concentration inside the workpiece changes gradually, and the changes between the two are different. The workpiece is carburized through surface Fe-C reaction and internal diffusion in the heat preservation stage of carburizing heat treatment. We can achieve the purpose of controlling carburization by controlling these two reactions.

According to the carburizing factors, the following mathematical model can be formed:

Surface Carbon Concentration:

Carburizing Depth:

Cp (furnace gas carbon potential)

C0 (the original carbon concentration of steel)

When the carburizing condition is satisfied (Ct≤Cp), at a certain carburizing time, there is a definite relationship between the two:

It can be seen from the above formula that the carbon potential and temperature are the key factors that affect the carburizing heat treatment. Increasing the carburizing temperature is beneficial to speed up the carburizing rate, and increasing the carbon concentration is beneficial to increase the surface hardness of the workpiece, but pay attention to the formation of carbides and affect the product structure. performance.