WAYS TO INCREASE PLASTICITY IN DEFORMATION OF TITANIUM ALLOYS WITH MINIMIZATION OF ENERGY COSTS

Abstract

This article dial with study, which was carried out to increase the ductility and deformability of titanium alloys BT1-0 and BT6, as well as the formation of highly plastic β-phase emissions in the microvolumes of the alloy. It was determined that the reason for the satisfactory combination of high plastic and impact characteristics with significant strength (σв> 800 MPa) were the following factors: the formation of a significant amount of metastable β-phase, has high plasticity and favorable morphology of the structure in the form of quasi-eutectoid, in which α -phase alternates with plastic β-layers. Research and experiments based on the new concept have proven the prospects of microalloying titanium with a non-deficient effective alloying element, iron. It also shows the real possibility of using much cheaper low-grade sponge-titanium (compared to high-purity sponge titanium) in the smelting of ingots and their processing with a decrease in energy consumption of processing processes and significant economy of titanium. Analysis of these experimental data allowed us to draw the following conclusions. With an increase in the amount of iron in the alloys of the Ti-Fe system, the yield strength and Brinell hardness naturally increased. As shown, iron "loosens" the crystal lattice of titanium and can’t increase the strength of the interatomic bond. Therefore, the nature of the strengthening of titanium iron is different. It is due to the following: grinding of grain in cast and forged states under the influence of iron. It was found that the size of cast grains decreased tenfold during doping titanium alloys by iron. Thus, with increasing concentration of iron in the titanium alloys, the length of the grain boundaries, which were an obstacle to the movement of dislocations, increased sharply.