中国激光, 2018, 45 (11): 1102003, 网络出版: 2018-11-15   

层间停留时间对激光熔化沉积TC11钛合金组织与力学性能的影响 下载: 671次

Effect of Interlayer Residence Time on Microstructures and Mechanical Properties of Laser Melting Deposited TC11 Titanium Alloys
作者单位
首都航天机械有限公司, 北京 100076
摘要
采用激光熔化沉积技术成形了TC11钛合金,研究了层间停留时间对其组织及性能的影响。结果表明,沉积态试样的宏观组织随层间停留时间的增加由等轴晶向柱状晶转变;在不同层间停留时间下,沉积态试样的内部均为极细α+β网篮组织,因此沉积态试样的力学性能呈高强低塑特征。随着层间停留时间的增加,沉积态试样的宏观层带现象更加明显,室温力学性能的各向异性显著增大,这是因为后续沉积层对已沉积层的表层重熔再沉积和热处理效应导致局部组织粗化、α相比例增加,进而引起沉积方向网篮组织的规律性不均匀。
Abstract
The TC11 titanium alloys are formed by the laser melting deposition technique and the effect of interlayer residence time on their microstructures and mechanical properties is investigated. The results show that the macrostructures of as-deposited samples change from equiaxed grains to columnar ones with the increase of interlayer residence time. For different interlayer residence time, there always exist extremely fine α+β basket-weave structures within the as-deposited samples, and as a result, the mechanical properties of these samples possess the characteristics of high strength and low plasticity. With the increase of interlayer residence time, the macroscopic layer band phenomenon becomes more and more clear, and simultaneously the anisotropy of mechanical properties at room temperature becomes more and more remarkable, which results from the coarsening of local microstructure, the increase of α phase proportion, and further regularity inhomogeneity of basket-weave microstructures in the deposition direction caused by surface remelting redeposition and annealing effects of current deposition layers.

严振宇, 周庆军, 侯谊飞, 杨光伟, 马存强, 王福德. 层间停留时间对激光熔化沉积TC11钛合金组织与力学性能的影响[J]. 中国激光, 2018, 45(11): 1102003. Yan Zhenyu, Zhou Qingjun, Hou Yifei, Yang Guangwei, Ma Cunqiang, Wang Fude. Effect of Interlayer Residence Time on Microstructures and Mechanical Properties of Laser Melting Deposited TC11 Titanium Alloys[J]. Chinese Journal of Lasers, 2018, 45(11): 1102003.

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