Motorcycle forgings heat treatment process introduction, motorcycle accessories
The heating temperature of the forging is one of the important process parameters of the heat treatment process. The selection and control of the heating temperature is the main problem to ensure the quality of the heat treatment of the forging. The heating temperature varies with the purpose of the metal material to be treated and the heat treatment, but the forgings are generally heated. Above the phase transition temperature, to obtain high temperature structure, the transformation takes a certain time, so when the surface of the forging reaches the required heating temperature, it is necessary to maintain some temperature for a certain time, so that the temperature inside and outside of the forging is uniform, so that the forging microstructure The transition is complete. This period of time is called the holding time. When using high energy density heating and surface heat treatment, the heating speed is extremely fast, generally there is no holding time, and the heat treatment time of chemical heat treatment is often longer.
The heat treatment process of forgings generally includes three processes of heating, heat preservation and cooling, and sometimes only two processes of heating and cooling, these processes are connected to each other and cannot be interrupted.
Forging heating is one of the important processes of heat treatment. There are many heating methods for metal heat treatment. The first use of charcoal and coal as a heat source, and then the use of liquid and gaseous fuels. Electrical applications make heating easy to control and environmentally friendly. These heat sources can be used for direct heating, or by indirect heating of molten salts or metals, or floating particles.
When the forging is heated, the workpiece is exposed to the air, and oxidation and decarburization often occur, which has a detrimental effect on the surface properties of the parts after the heat treatment. Thus, the metal should generally be heated in a controlled or protective atmosphere, in a molten salt and in a vacuum, or protected by a coating or packaging process.
Cooling is also an indispensable step in the heat treatment process. The cooling method varies from process to process, mainly controlling the cooling rate. Generally, the decooling cooling rate is the slowest, the positive cooling rate is faster, and the quenching cooling rate is faster. However, there are different requirements depending on the type of steel. For example, the hardware steel can be hardened at the same cooling rate as normal fire.
The metal heat treatment process can be roughly divided into three types: overall heat treatment, surface heat treatment and chemical heat treatment. Depending on the heating medium, heating temperature and cooling method, each category can be divided into several different heat treatment processes. The same metal uses different heat treatment processes to obtain different microstructures and thus different properties. Steel is the most widely used metal in the industry, and the steel microstructure is also the most complex, so the steel heat treatment process is very diverse.
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