XIONGDA METAL
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25
2024
-
01
Precautions for powder metallurgy heat treatment
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1. temperature control
The core of heat treatment of powder metallurgy parts is temperature control. Due to the high porosity of powder metallurgy parts, deformation and cracking are easy to occur at high temperatures. Therefore, it is necessary to strictly control the heating temperature and holding time according to the heat treatment requirements of different materials to prevent thermal deformation and cracks of the parts.
2. cooling mode
Powder metallurgy parts need to be cooled down by a cooling process after heating treatment to make them have the required physical and mechanical properties. Different cooling methods have different effects on the performance of parts. For example, oil quenching is a quenching method that can obtain high hardness and high strength, but it may cause excessive internal stress of the part, so stress relief treatment is required. Water quenching will produce higher residual stress, but also need to pay attention to control.
3. atmosphere control
In the process of heat treatment, the atmosphere has an important influence on the quality and performance of powder metallurgy parts. For example, in the heat treatment of carbon steel, it needs to be carried out in a specific atmosphere, otherwise it will affect the hardness and surface quality. In the process of high temperature oxidation and nitriding, the selection and control of the atmosphere will directly affect the quality and hardness of the surface coating.
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