Vacuum heat treatment can achieve almost all heat treatment process, such as quenching, annealing, tempering, carburizing, nitriding, nitriding. For the quenching process, it can realize gas quenching, oil quenching, nitrification quenching, water quenching, etc. Compared with the traditional heat treatment, it has the following advantages:
1. No oxidation, no decarbonization, no carbon inside the workpiece and the surface has a good protective effect.
Oxidation makes the metal surface loss metallic luster, surface roughness increases, the accuracy decline, and steel surface oxide often caused quenching soft spots and quenching cracking, oxidation also can reduce the strength of steel and other mechanical properties.
Vacuum heat treatment, the metal is heated at a certain degree of vacuum, the workpiece avoids contact with oxygen, the workpiece not oxidized, no decarburization, can get bright surface and better heat treatment quality. In vacuum state, it will not happen reduction reaction, it will not happen to increase carbon phenomenon. Compared with the workpiece surface from adding protective agent to vacuum quenching , can be clearly found that the advantages of vacuum heat treatment.
2. To improve the overall mechanical properties, degassing and promote the purification of metal surface
Vacuum on the liquid metal has a significant effect of degassing, solid metal dissolved in the gas also has a good exclusion effect. The most harmful gas in the metal is hydrogen. When vacuum heating is used, the hydrogen in the metal and alloy can be reduced to a minimum and the hydrogen embrittlement is eliminated, thus improve the plasticity, toughness and fatigue strength of the material, and improve the overall mechanical properties of the workpiece. When the metal and the alloy are heated in a vacuum, if the degree of vacuum is lower than the decomposition pressure of the corresponding oxide, the oxides are decomposed and the free oxygen formed is immediately discharged into the vacuum chamber to further improve the quality of the metal surface.
3. The workpiece deformation
In general, the workpiece is heated by heat radiation in the furnace, the internal and external temperature difference is small, the thermal stress is small, thus determining the vacuum heat treatment process parts deformation is small. While heating and quenching under vacuum, automatic complete, so avoid the workpiece carry under the hot state(although salt bath treatment and atmosphere protection treatment in an anaerobic environment, but still in the air or oxygen molecules containing quenching medium to complete the quenching), reduced the man-made processing deformation.
4. Can reduce the workpiece volatility of alloy
Vacuum heat treatment can heating and vacuum quenching in a controlled atmosphere, thereby reducing the volatility of gold element of the workpiece, ensure the workpiece heat treatment quality.
5.Vacuum heat treatment furnace with high thermal efficiency
Vacuum heat treatment furnace with high thermal efficiency, can achieve rapid heating and cooling. Stability and good repeatability. Good working environment, safety operation, no pollution.
Tag: Vacuum heat treatment,small heat treatment furnace,tools industry heat treatment furnace
Edit by: Jimmy