Based on the wire laser additive manufacturing, this paper innovatively proposes a new process of additive manufacturing of laser wobble fuse combined with laser swing welding technology. Firstly, the laser power P, wire feeding speed Vs, and printing speed Vp are controlled in the process without laser swing, and the appropriate swing frequency f, swing amplitude A and overlap rate η are adjusted under circular swing. A single-channel experiment was performed on TC4 titanium alloy, and it was found by comparison that the deposition quality was better when P = 2500 W, Vs = 3 m/min, Vp = 2.5 m/min, f = 300 Hz, A = 1 mm and η = 50%. Based on the single-pass experiment, multi-pass multilayer printing was carried out, and the microstructure and phase of the as-deposited state and after annealing were analyzed by XRD, TEM, SEM and EBSD. The results show that the microstructures are mainly slender acicular martensite α′ and initial columnar β grains under single-pass printing and multi-layer multi-pass printing. In addition, the β grains are irregular in shape, the growth orientation changes obviously, the α′ size is small, and the structure is closely arranged, which is a typical widmanstetten structure. After recrystallization annealing (800 ℃/2 h, furnace cooling), the grain boundary of α phase appears, and the α phase tends to grow.
顾海,张捷,孙健华,姚建南,孙中刚. 激光摆动对增材制造钛合金微观组织的影响行为研究[J]. 航空制造技术, 2022, 65(20): 124-131.
GU Hai, ZHANG Jie, SUN Jianhua, YAO Jiannan, SUN Zhonggang. Study on Effect of Laser Swing on Microstructure of Additive Manufacturing Titanium Alloy[J]. Aeronautical Manufacturing Technology, 2022, 65(20): 124-131.