Effect of structure and phase composition on the mechanical properties of titanium alloy VT20

Abstract

1. Slow cooling in the α→β range tends to improve the ductility and lower the strength of alloy VT20. With rapid cooling both from α→β temperatures and in the β range the ductility decreases and the strength increases slightly, especially with quenching from temperatures in the α→β range. 2. The low-cycle fatigue strength decreases most for notched samples after slow cooling from temperatures in the β range. 3. Redistribution of alloying elements occurs during slow cooling, with segregation of molybdenum, vanadium, and zirconium in the phase boundaries, forming an interlayer of stable β phase at 20°.