On 2018-08-08 14:48:54
Vacuum heat treatment protection
The protective effect of vacuum heat treatment on the interior and surface of the workpiece
Vacuum heat treatment is a comprehensive technology combining vacuum technology and heat treatment, which means that all and part of the heat treatment process is carried out in the vacuum state. SIMUWU vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, chromizing, nitride, during the quenching process can realize gas quenching, quenching, nitrate quenching oil, water quenching and so on, compared with the ordinary heat treatment, there is no oxidation and decarburization, it does not increase carbon has good protective effect on the surface of a workpiece and internal.
Oxidation causes the metal surface to lose its metallic luster, increase the surface roughness and decrease the precision, and the steel surface oxide skin is often the root cause of quenching soft point and quenching cracking, oxidation reduces the steel strength and other mechanical properties. Decarburization refers to the phenomenon that the surface carbon content of steel decreases when heated.
In general, the steel is oxidized and decarburized at the same time. As the carbon content of decarburized layer is oxidized, the reduction of carbon content will significantly reduce the steel's quenching hardness, wear resistance, and fatigue performance, and the decarburization of high speed steel will reduce the red hardness.
But the vacuum heat treatment because the metal is heated in a certain degree of vacuum, the workpiece avoids contact with oxygen, the workpiece has no oxidation, no decarburization, can get a bright surface and better heat treatment quality, at the same time in the vacuum state, will not occur reduction reaction, will not occur carbon phenomenon.