研究了不同热处理制度对激光沉积制造TB6钛合金力学性能的各向异性影响，结合光学显微镜（OM）、扫描电镜（SEM）和透射电镜（TEM）分析显微组织的演化过程，探究各向异性随热处理改变的变化趋势及影响机理。结果表明：激光沉积制造TB6钛合金组织中原始β晶粒形状与初生α相（α_p相）的尺寸形貌受热梯度影响较大，两方面因素共同作用下，使沉积态试样室温拉伸性能出现各向异性，在垂直沉积方向（X向）上的抗拉强度相比沉积方向（Z向）上的高7.3%，屈服强度高5%、而伸长率则低32.4%。低温退火对显微组织的影响较小，仅塑性的各向异性有所降低；高温退火后α_p相长宽比差异程度降低，室温拉伸性能的各向异性随之降低；固溶时效后析出的次生α相（α_s相）使合金强化机制发生改变，且α_s相无明显的择优析出生长，使得强度提高的同时其室温拉伸性能的各向异性趋于消除。

The effects of different heat treatment processes on the anisotropy of TB6 titanium alloy fabricated by laser deposition manufacturing were investigated.The evolution of microstructure was analyzed by using optical microscope （OM）， scanning electron microscope （SEM）， and transmission electron microscope （TEM）. The variation trend and influence mechanism of anisotropy with heat treatment were investigated. The present research shows that the original β grains and the morphology of the primary α phase （α_p phase） are greatly affected by the thermal gradient. The original β grains in the microstructure of TB6 titanium alloy fabricated by laser deposition manufacturing are elongated along the deposition direction and are ellipsoidal. In addition， the relative slender α_p phase parallel to the deposition direction is found. These two factors jointly lead to the anisotropy of room temperature tensile property of the as-deposited samples. The tensile strength in the vertical deposition direction （X-direction ） is 7.3% higher， the yield strength is 5% higher， and the elongation is 32.4% lower than that in the deposition direction （Z-direction）. The low-temperature annealing treatment has little effect on microstructure， only the anisotropy of plasticity is decreased. After high-temperature annealing treatment， the difference in aspect ratio of α_p phase is significantly reduced， leading to the anisotropy of the room temperature tensile property decreases. The strength are still higher in the X-direction， and the elongation is higher in the Z-direction. The strengthening mechanism of the solution-aging treating sample is completely changed due to the precipitation of the secondary α phase （α_s phase）. In addition， there is no obvious preferential growth of α_s phase after heat treatment， so the anisotropy of the room temperature tensile property tends to be eliminated as the strength increases.