针对近α型Ti-6.0Al-3.0Zr-0.5Sn-1.0Mo-1.5Nb-1.0V新型钛合金，在退火温度740 ℃的基础上，研究了退火时间对其组织与力学性能的影响。结果表明：经过三次真空自耗电弧炉熔炼，三火热轧后得到的板材组织由初生α相基体及β转变组织组成的部分再结晶组织和加工态组织。随着退火时间的增加，退火板材的显微组织都以初生α相为主，α相所占的比例逐渐增加，β相的比例逐渐降低，组织中长条状α相逐渐破碎球化，等轴α相的大小开始均匀化，粗化。热轧板材随着退火时间的增加，板材的延伸率逐渐增加，抗拉强度出现先降低再增加然后又降低的变化趋势，屈服强度先增加后降低，显微硬度先增加后降低。退火时间为1 h时断口由滑移带、涟波、小等轴韧窝组成，断裂方式为韧性断裂，退火时间大于等于2 h时断口完全由等轴韧窝组成，断裂方式为韧性断裂。根据实验结果确定740 ℃退火最佳保温时间为2 h，此时合金板材的抗拉强度、屈服强度、延伸率和显微硬度分别为：984 MPa、941 MPa、15.27%、347.67 HV。研究结果对高强耐蚀钛合金退火工艺的制定有指导作用，为解决钛合金在实际生产中遇到的问题提供了科学依据。
The effect of annealing time on microstructure and mechanical properties of TI-6.0 Al-3.0 Zr-0.5 Sn-1.0Mo-1.5 Nb-1.0 V new titanium alloys were studied based on the optimum annealing temperature of 740 ℃. The results show that after three times smelting by vacuum consumable arc furnace and three hot rolling, the microstructure of the plate is the partial recrystallization and the processing status structure composed of the primary α phase and structure of β transformation. The microstructure of the annealed sheet was mainly composed of the primary α phase, the proportion of α phase increased gradually, the proportion of β phase decreased gradually. The strip-shaped α phase in the microstructure was broken and spheroidized gradually, and the size of equiaxial α phase began to be homogenized and coarsened. With the increase of annealing time, the elongation of the sheet increases greatly, while tensile strength decrease first, then increase and then decrease again, the yield strength and the microhardness increases first and then decreases. When the annealing time is 1 h, the fracture mode is ductile fracture and fracture was composed of slip bands, ripples appearance and small equiaxial dimples. When the annealing time is more than 2 h, the fracture mode was ductile fracture and the fracture was completely composed of equiaxial dimples. According to the experimental results, the optimum annealing heat preservation time at 740 ℃ is 2 h, at which time the tensile strength, yield strength, elongation and microhardness of the alloy plate are respectively 984 MPa, 941 MPa, 15.27% and 347.67 HV. The main results from this paper can guide the formulation of the annealing process of high strength corrosion resistant titanium alloy, and provide a scientific basis for solving the problems encountered in the actual production of titanium alloy.