Influence of technological parameters of powder semiproducts twist extrusion on the final properties of parts material


I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Mathematical Models and Computing Experiment in Material Science - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2015, #17


The twist еxtrusion of porous billets is studied. The effect of process and geometrical parameters (counterpressure, container sizes, number of passes) at the porosity distribution and accumulated strain in solid phase is considered. It is shown that counterpressure allow the prevention of swelling and provides the uniformity of density distribution. The decrese of the number of passes leads to the growth of a mean density and in accumulated matrix strain. The given process is accomponied by the smoothing of density distribution. The container stipulates additional hydrostatic pressure within the volume of porous billet. It, nevertheless, does not change qualitative character of density distribution.