1. Przeróbka plastyczna tytanu Grade2 metodą wyciskania hydrostatycznego.
- Author
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Topolski, Krzysztof and Garbacz, Halina
- Subjects
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HYDROSTATIC extrusion , *TESTING , *PLASTIC extrusion , *GRAIN refinement , *BULK solids - Abstract
Hydrostatic extrusion (HE) belongs to the technology of plastic working, and is a specific variation of direct extrusion. Direct extrusion methods are mainly used to produce oblong solid or hollow products with different transverse-section profiles. The hydrostatic extrusion presented in this paper concerns titanium Grade2 and rods with a circular transverse section. The results of numerous studies have shown that the deformation of various metals by the HE method enables grain refinement and significant strengthening. Generally, it was found, that the HE method makes it possible to manufacture metals having nanograined and ultrafinegrained structures. The aim of the work was to evaluate the possibilities of using the hydrostatic extrusion method for plastic working of titanium Grade2. The HE method was characterized and its great potential in the context of processing Ti Grade2 was demonstrated. In this paper, four exemplary, independent technological processes of the hydrostatic extrusion of titanium were presented and discussed. The results of our structural research and tests of the mechanical properties of the products obtained were presented. Those results proved that, using HE technology, it is possible to obtain in titanium Grade2 a nanograined structure characterized by an average grain size of 50-70 nm. At the same time, a significant strengthening of the extruded material was observed, expressed by an increase in yield strength, tensile strength and hardness. The obtained nanograined titanium was characterized by mechanical properties comparable to that of titanium Ti6Al4V alloy. Moreover, in the presented work it was confirmed that it is possible to produce solid and bulk nanograined Ti in the form of rods of different diameters i.e. that is possible to scale up the diameter of the billet and the product. [ABSTRACT FROM AUTHOR]
- Published
- 2019