What changes does sandblasting treatment have on the stress state of stainless steel, and how to alleviate it?
Publish Time: 2024-12-16
Sandblasting treatment, as a common surface treatment technology, is widely used for surface cleaning, decontamination, roughness increase and beautification of stainless steel. However, during the sandblasting process, the surface and internal stress state of stainless steel will change significantly, which may have an important impact on the performance and service life of the material.
Sandblasting treatment uses high-speed abrasive particles to hit the surface of stainless steel, causing local plastic deformation and micro cracks, thereby changing the stress state of the material. This treatment usually increases the surface residual stress of the material, especially in the case of high-pressure sandblasting or long-term sandblasting, the surface of stainless steel may have high compressive stress, while tensile stress may appear inside.
The increase in residual stress may affect the mechanical properties of stainless steel, such as reducing fatigue strength and corrosion resistance. Therefore, after sandblasting treatment, some measures need to be taken to alleviate the stress state of stainless steel to improve its service life and performance.
A common mitigation method is heat treatment, such as annealing or stress relief treatment. These treatments can reduce the residual stress by heating the stainless steel to a certain temperature and holding it for a period of time, and then slowly cooling it to release and redistribute the internal stress.
In addition, mechanical methods such as vibration aging or hammering can also be used to reduce the residual stress of stainless steel. These methods redistribute the stress inside the stainless steel by introducing new vibration or impact force, thereby achieving the effect of relieving stress.
In addition to the above methods, selecting appropriate sandblasting parameters and media is also an important means to relieve the stress state of stainless steel. For example, reducing the sandblasting pressure, shortening the sandblasting time, and selecting sandblasting media with moderate hardness and uniform shape can reduce the residual stress of stainless steel to a certain extent.
In summary, the sandblasting treatment has a significant effect on the stress state of stainless steel, but through reasonable heat treatment, mechanical treatment and selection of appropriate sandblasting parameters and media, the stress state of stainless steel can be effectively relieved and its mechanical properties and corrosion resistance can be improved.
