The advantages and disadvantages of powder-metallurgy stainless steel and its means of overcoming
|If the melting process is used to produce stainless steel products, due to the difficulty of cutting, it will lead to a series of arrangements of the manufactured parts, such as poor dimensional accuracy and insufficient surface roughness. In applications that solve similar problems, powder metallurgy plays a vital role.|
Compared with the stainless steel produced by the traditional melting process, powder metallurgy stainless steel has the advantages of close to net forming, high dimensional accuracy, high material utilization, and uniform structure. Instrumentation and other industries.
However, it is not that the powder metallurgy stainless steel is perfect. Because of the pores in it, the mechanical properties, wear resistance and corrosion resistance of the powder metallurgy stainless steel are greatly reduced, which severely limits the application of this product.
However, studies have shown that almost all properties of powder metallurgy stainless steels increase with increasing density, so as long as the density of powder metallurgy stainless steel is increased and its porosity is reduced, it can play a key role in improving the performance of powder metallurgy stainless steels. .
The reason why there is a lot of emptiness in the interior of powder metallurgy stainless steel has a lot to do with the method of solid phase sintering, so users began to replace it with super solid phase liquid phase sintering, so that the stainless steel pre-alloy powder formed a liquid during sintering. Phase, liquid phase fills the pores by flow to increase the density and performance of the sintered body. ,
Unlike ordinary liquid-phase sintering, super-solid-phase liquid-phase sintering is the sintering of pre-alloyed powders, and it is always a single phase during the sintering process. The sintering temperature will always be between the solid-phase and liquid-phase. In addition, the particles can be rearranged under the action of the capillary force of the liquid phase, and the sintered body can be made dense by the liquid phase flow and mass transfer.
In addition, by adding a suitable strengthening phase, one of the main ways to improve the performance of powder metallurgy stainless steel, especially its hardness and abrasion resistance, have been improved accordingly.
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Link to this article：Advantages and disadvantages of stainless steel powder metallurgy
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