研究了激光熔覆沉积Ti6Al4V过程中超声振动对其沉积态及固溶时效成形件微观组织和力学性能的影响。研究结果表明,沉积时超声振动可减小成形件的表面粗糙度和残余应力,使β柱状晶得以细化,成形件强度和延伸率略有升高。成形件经过固溶时效处理后,形成了由等轴α相、网篮片状α相和转变β相组成的混合组织,但晶粒仍然较小,延伸率较高,塑性大幅提升,强度有所降低,综合力学性能超过了锻件标准。

The effect of ultrasonic vibration on the microstructures and mechanical properties of the as-deposited and the solution-aging treated forming parts is investigated during the laser cladding deposition of Ti6Al4V alloys. The research results show that, the ultrasonic vibration during deposition can reduce the surface roughness and residual stress of forming parts, which makes the β columnar grains refined, and the strength and elongation of the forming part increase slightly. As for the forming parts after solution-aging treatment, a mixed structure composed of equiaxed α phase, basket-shaped flaky α phase and converted β phase is formed. However, the grains are still small, the elongation is relatively high, the plasticity increases significantly, and the strength decreases little. The comprehensive mechanical properties overpass the forged part standard.