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以TA15钛合金球状粉末为原料,利用激光沉积制造技术制备了TA15钛合金厚壁件。研究了不同的退火温度对激光沉积TA15钛合金的拉伸力学性能及显微组织的影响,分析了经不同温度退火后合金的断裂机理以及晶界两侧α团簇的变形机制。结果表明,经退火处理后的合金显微组织中α相排列有序,α片层厚度随退火温度的变化不大;显微硬度值受α相含量影响,但随退火温度变化不大;晶界两侧α团簇变形机制不同;裂纹易在β相处萌生并扩展;沿着沉积方向和垂直于沉积方向上的合金拉伸断裂机制不同,分别为韧性断裂和半韧性半解理断裂。
TA15 titanium alloy spherical powder as raw material, the use of laser deposition manufacturing technology prepared TA15 titanium alloy thick-walled parts. The effects of annealing temperature on the tensile properties and microstructure of laser-deposited TA15 titanium alloy were studied. The fracture mechanism of the alloy after annealing at different temperatures and the deformation mechanism of α-clusters on both sides of the grain boundary were analyzed. The results show that the α phase is ordered and the thickness of α lamellae varies little with the annealing temperature. The microhardness value is affected by α phase content, but little changes with the annealing temperature. The deformation mechanisms of α clusters on both sides of the boundary are different. The cracks are easy to initiate and extend at the β phase. The ductile and semi-cleavage fracture are respectively the ductile fracture and semi-cleavage fracture along the deposition direction and the tensile fracture mechanism perpendicular to the deposition direction.