Improvement of the High-Temperature Thermomechanical Treatment of Rolled Bars from Titanium Alloy VT3-1

Variation of mechanical properties and structure of bars from alloy VT3-1 obtained with the use of high-temperature thermomechanical treatment (HTTMT) due to their heating and straightening in a stretcher and due to preliminary hot deformation of preforms in a helical rolling mill is described. It is shown that straightening at 550 - 700°C with an elongation of about 2% causes a certain decrease in the ultimate rupture strength and a substantial increase in the ductility and impact toughness. Preliminary rolling in a helical rolling mill affects the properties of the bars after final heat treatment in a similar manner. The suggested process is shown to raise the quality of the bars and is realizable in the production of rolled bars from alloy VT3-1 with the use of HTTMT.[PUBLICATION ABSTRACT]