Effect of heat treatment process on the structure and tensile properties of Ti662 titanium alloy bars

In order to explore the effects of different solution aging temperatures on the microstructure and mechanical properties of Ti662 titanium alloy, Select Φ103mm Ti662 titanium alloy bar produced by conventional forging. The alloy bar was treated with different heat treatment systems, and then an optical microscope and an electronic tensile testing machine were used to study the relationship between its structure and tensile properties. The results show that when the solid solution temperature is constant, as the single aging or double aging temperatures increase, the primary α phase content changes little, the secondary α phase gradually coarsens, the alloy strength decreases, and the plasticity increases. When the aging temperature is constant, for single solid solution, as the solid solution temperature increases, the primary α phase content of the alloy continues to decrease, the β transformation structure gradually increases, the alloy strength continues to increase, and the plasticity continues to decrease; for dual solid solution, as the primary solid solution temperature increases, the alloy The content of the primary α phase continues to decrease, and the content of the β transformation structure gradually increases. However, as the primary solid solution temperature gradually approaches the β phase transformation temperature, the β transformation structure gradually coarsens, the secondary ɑ phase is distributed in a needle shape, the thickness and aspect ratio gradually increase, the alloy strength gradually decreases, and the plasticity has an upward trend. On the basis of single solid solution aging, adding double solid solution or double aging does not significantly improve the room temperature tensile properties of the alloy.