Peculiarities of particle splicing at interlayer boundaries of hot-formed powder materials

Abstract

Modern production of machine-building parts and building structures is directly related to the production of high-quality hot-formed powder materials. Powder metallurgy as a modern innovative technology, creating materials with unique physical properties, has such a significant advantage as environmental safety. The absence of aggressive and environmentally hazardous components in the technology makes the process of manufacturing powder steels harmless to the environment. The present scientific study deals with the given microstructures of hot-pressure treated powder materials. Residual porosity, which significantly affects the functional properties (mechanical and physical), is considered to be a fundamental factor influencing the areas of powder steel use. The mechanism of mutual diffusion of the introduced components and peculiarities of modeling the structure of powder blanks under conditions of sintering and subsequent deformation were studied. The influence of initial powder particle size on the formation of powder alloys structure under the characteristic features of homogenization under sintering conditions was analyzed. The conducted works allow to study the character of influence of technological parameters in the process of processing on the quality of powder materials splicing, formation of features of their structure and functional properties and qualities. The structure of almost porosity-free steel obtained during the tests of hot-pressure treatment is characterized by complete coverage of the entire number of particles by plastic deformation, which indicates its homogeneity, inherent in the initial particle size distribution of iron powder. The conducted scientific studies of physical processes during hot pressure deformation prove the decisive influence of the choice of technological parameters on improving the quality of splicing, as well as on the formation of microstructure and properties of powder steels.