Heat treatment process

Release Date：2013-12-23 00:00 Source：http://www.ksyyc.com Click：

The heat treatment process generally includes heating , insulation, cooling the three processes , sometimes only two heating and cooling processes . The process of convergence with each other , can not be stopped.
Heating is one of the important processes of heat treatment . Many metal heat treatment heating method , the first is the use of charcoal and coal as a heat source , and the application of recent liquid and gaseous fuels . Electric heating applications easy to control , and no environmental pollution. These can be directly heated using a heat source , or by a molten salt or metal , as well as the floating particles are heated indirectly .
Heating the metal , the workpiece is exposed to the air, often oxidized, decarburization ( i.e. reduce the carbon content of the steel parts of the surface ) , which is the part of the surface properties after heat treatment has a very adverse effect . Thus normally be of metal in a controlled atmosphere or in a protective atmosphere , and the molten salt is heated in vacuum , or the method of packaging can also be used to protect the coating is heated .
The heating temperature is one of the important parameters of the heat treatment process , choice and control the heating temperature , the heat treatment is to ensure the quality of the main problems. The purpose of the heating temperature was treated with metal material and heat treatment vary, but are generally heated to a temperature above the phase transition , in order to obtain high-temperature tissue. Another change will take some time , so when the metal surface to achieve the required heating temperature , this temperature must remain at a certain time , so that the temperature inside and outside the same, so that the microstructure changes completely , this time called the holding time . When using high energy density heat and surface treatment , heating fast, generally there is no holding time, and holding time chemical treatment is often longer . The cooling step is also missing is not available during the heat treatment process , the cooling process due to the different methods and different, mainly to control the cooling rate . Usually the slowest cooling rate of annealing , normalizing, cooling speed, faster quench cooling . But also because different types of steel have different requirements , such as steel can be used empty hard normalizing hardened the same cooling rate .

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