Heat treatment process generally includes heating, insulation, cooling three processes, sometimes only heating and cooling two processes. These processes are interconnected and uninterrupted. Heating is one of the most important processes in heat treatment. There are many heating methods for metal heat treatment. Charcoal and coal were first used as heat sources, and liquid and gas fuels were recently used. The application of electricity makes heating easy to control without environmental pollution. These sources can be used for direct heating, or indirect heating through molten salt or gold, or even floating particles.<a href="https://www.ht-guide.com/experiment-furnace/Laboratory-Electric-Argon-Arc-Furnace.html">Laboratory Electric Argon Arc Furnace</a>
When the metal is heated, the workpiece is exposed to air, and oxidation and decarbonization often occur (that is, the carbon content on the surface of the steel parts is reduced), which has a very adverse effect on the surface properties of the parts after heat treatment. Therefore, metals should usually be heated in controlled or protective atmosphere, molten salt and vacuum, or by coating or packaging. The heating temperature is one of the important technological parameters in the heat treatment process. Selecting and controlling the heating temperature is the main problem to ensure the quality of heat treatment. <a href="https://www.ht-guide.com/vac-furnace/SIC-Vacuum-Sintering-Furnace-.html">SIC Vacuum Sintering Furnace</a>
The heating temperature varies with the object of heat treatment and the metal material being treated, but it is generally heated above the phase change temperature to obtain high temperature microstructure. In addition, the transformation takes a certain time, so when the surface of the metal workpiece reaches the required heating temperature, it must be kept at this temperature for a certain period of time, so that the internal and external temperatures are consistent, so that the microstructure of the transformation is complete, this period is called holding time. When high energy density heating and surface heat treatment are used, the heating speed is very fast, and there is no heat preservation time in general, but the heat preservation time of chemical heat treatment is often longer.<a href="https://www.ht-guide.com/vac-furnace/Vacuum-Induction-Furnace-.html">Vacuum Induction Furnace</a>

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