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What is surface hardening and what are the types of surface hardening?

Article source: Hebei YUANTUO electromechanical Click: Time of publication: May 7, 2019 17:10:41

Surface hardening It is a kind of heat treatment method that the workpiece is heated to the quenching temperature quickly and then cooled rapidly, so that only the surface can obtain the quenched structure. In other words, the surface of the workpiece reaches the quenching temperature quickly by rapid heating. When the heat is not transferred to the core, it is cooled rapidly. In this way, high hardness martensite structure is obtained on the surface, while the original structure with good toughness and plasticity is still retained in the core. The surface hardening process can make the surface of parts have high strength, hardness and wear resistance, while the core has a certain strength, enough plasticity and toughness.
 
In order to reach the temperature above the phase transition point in the limited depth of the surface layer of the workpiece, it is necessary to heat the surface of the workpiece with a high energy density, so that the heat on the surface of the workpiece can not be transmitted to the center of the workpiece, resulting in a large temperature difference between the surface and the center.
   
Therefore, surface quenching is often named and classified in different forms of surface energy supply.
 
There are three kinds of surface hardening, such as surface heating, electric resistance quenching and surface hardening. At present, induction heating surface quenching is widely used in heat treatment production, followed by flame heating surface quenching.
 
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