Analysis of mechanical properties material during the process alternate pressing and multiaxial compression
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1
Faculty of Production Engineering and Materials Technology, Czestochowa University of Technology, al. Armii Krajowej 19, 42-201 Czestochowa, Poland
2
Faculty of Mechanical and Industrial Engineering, Warsaw University of Technology, ul. Narbutta 86, 02-524 Warszawa
Corresponding author
Mariusz Salwin
Faculty of Mechanical and Industrial Engineering, Warsaw University of Technology, ul. Narbutta 86, 02-524 Warszawa
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ABSTRACT
The paper presents the results of studies on the alternating use of countercurrent extrusion and multiaxial pressing. This process induces in the plastically formed material deformation states similar to those observed during channel extrusion and cyclic extrusion.
According to the results of numerical studies, during extrusion, a zone of large plastic deformations is formed on the side surface of the material, which gradually disappears towards the material axis. After the multiaxial pressing stage, when the material regains its original shape, the large deformation zone moves and takes the shape of a ring in the area under the impactor. During the next extrusion operation, a significant deformation zone is again formed on the material side, while previously deformed parts of the material are pushed out towards the material axis. Based on the tests carried out, it can be concluded that the alternating use of extrusion and multiaxial pressing causes the deformations to accumulate and obtains a deformation state that is particularly beneficial for grain refinement. By repeating the process multiple times, a large, uniform deformation can be obtained throughout the entire volume of the material. The paper also presents the results of material tests obtained in laboratory experiments, which confirm the increase in strength properties using the described procedure.