Powder high-speed steel is a high-speed steel product made of high-speed steel fine powder by special method, which is called PMHSS for short. Powder high speed steel has the microstructure characteristics of fine carbide particles, few inclusions and uniform distribution, which makes the bending strength of high speed steel high. The hardness and cutting performance have been significantly improved.
The difference between powder high-speed steel and traditional high-speed steel lies in the manufacturing process. By adding some insufficient metal elements, steel with various components and elements can be smelted as needed. Generally, like traditional high-speed steel, it is divided into Mo (Mo) series and W (W) series.
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Manufacturing technology of powder steel
The preparation process of powder metallurgy high speed steel is different from that of ordinary high speed steel. The molten steel is not directly injected into the crystallizer, but atomized by high-pressure gas (such as nitrogen) or high-pressure water, and the atomized metal droplets are quickly cooled into fine powder 4 (diameter less than 1mm), which is called atomized high-speed steel powder.
Because the carbides in steel aqueous solution can't separate out quickly and form clusters during rapid cooling, the carbide particles in the obtained powder are fine and evenly distributed. PMHSS products are formed and consolidated by atomized high speed steel powder. Common preparation techniques include hot isostatic pressing, cold pressing sintering and spray forming.
References:
Baidu encyclopedia-powder high speed steel