Investigation on Influence of Heat Treatment on Mechanical Property of Ti-6Al-4V Alloy

The influences of different heat treatment(solution and aging treatment) on the mechanical properties of Ti-6Al-4V titanium alloy were studied.The relation between the microstructure,impact fracture images and mechanical properties were analyzed by metallurgical microscope and environment scanning electron microscope(ESEM).The results show that the microstructure of hot rolling state is changed by heat treatment.The obtained mixed tissue of equiaxed and acicular enables the comprehensive performance of the alloy better match.The strength and modulus of elasticity are significantly improved.And the plastic toughness significantly reduces because a large number of dispersion phases are precipitated.Good mechanical properties will be obtained by optimizing the heat treatment system.The better combination property can be gotten after treated at 960 ℃ for 1 h+WC and then at 550 ℃ for 6 h+AC.