We introduced what is vacuum heat treatment in the last batch of articles, and now let's introduce the characteristics of vacuum heat treatment. The vacuum state is an excellent protective environment. The mechanical parts after heat treatment in the vacuum environment are smooth and bright in appearance, the internal structure has been changed, and the mechanical properties are excellent. Its characteristics are as follows,

(1) Vacuum heat treatment saves energy and is economical. Compared with normal pressure heat treatment, vacuum heat treatment can save energy, because the vacuum heat treatment furnace has good insulation effect, less heat loss, reduced energy consumption, mechanization and automation, saving manpower and time, and then reducing product costs.

(2) Vacuum heat treatment can complete environmental protection. Compared with normal pressure heat treatment, vacuum heat treatment is carried out in a closed environment, with clean environment, less waste discharge and environmental pollution.

(3) The operation of vacuum heat treatment is simple. Compared with normal pressure heat treatment, the operation requirements for workers are simple, it is not easy to cause errors, and the quality is easy to ensure. The mechanical parts after vacuum heat treatment can be directly used for electroplating, without degreasing, cleaning or other surface processing, eliminating many auxiliary processing procedures, saving processing time and processing costs, and reducing production costs.

(4) The mechanical parts of vacuum heat treatment are of good quality, strengthen the mechanical properties, and prolong the service life. Vacuum quenching can quench any material with oil quenching and gas quenching to the highest hardness; vacuum heat treatment of high-speed steel instead of salt bath can achieve very good results, and the mechanical parts of vacuum heat treatment are not easy to crack.

(5) The deformation of vacuum heat treated parts is small. The reason for the deformation of the workpiece during the heat treatment process is generally the phase transformation stress of the workpiece during the heat treatment process; the second is the thermal stress caused by the temperature change speed of each part of the workpiece during the heating and cooling process. The temperature in the vacuum heat treatment furnace is uniform, and the heat is heated under vacuum conditions. The heat exchange method is mainly thermal radiation instead of convection heating, so the heating temperature is uniform, and the temperature difference between the inside and outside of the workpiece is small, so the deformation of the workpiece is small.

(6) Vacuum heat treatment is easy to complete equipment automation, improve the degree of equipment automation, and ensure good quality repeatability of workpiece heat treatment. Because the working parameters required in the vacuum heat treatment process can be received and transmitted by modern sensors, all quantitative process paths and execution procedures can be pre-programmed.

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