Abstract
The effect of structure on the properties of powder metallurgy steels alloyed with phosphorus was investigated. Initial mixtures were prepared by the traditional method and by mechanical alloying. Mechanical alloying decreased the sintering temperature, increased the density, and improved the properties thanks to the formation of dispersed phases, a high-density cellular dislocation distribution, and the trapping of phosphorus atoms by the dislocation atmosphere, which prevented coagulation of the phosphides. It was established that when closed porosity is formed, the changes in mechanical properties and fracture resistance do not agree.
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