超声振动辅助激光金属成形IN718沉积态组织及性能的研究

Research on As-Deposited Microstructures and Properties of IN718 Parts by Ultrasonic Vibration-Assisted Laser Metal Forming

在激光金属成形IN718过程中引入超声振动,测量了成形件的表面粗糙度、残余应力和室温力学性能,并对成形件的微观组织进行了分析。结果表明,施加超声振动后,成形件的表面粗糙度和残余应力得到显著改善,微观组织得以细化,抗拉强度和屈服强度均有提高。当超声频率为17kHz、超声功率为44 W时,与未施加超声振动时相比,超声振动作用下成形件的残余应力在x和y两个方向上分别降低了47.8%和61.6%,屈服强度、抗拉强度和断面伸缩率分别提高了6.1%,2.7%和10.6%,延伸率降低到29.2%。

Ultrasonic vibration is introduced to the process of laser metal forming IN718, the surface roughness, residual stress, and mechanical property at room temperature of the forming parts are tested, and the microstructure of the forming parts is analyzed. The results show that, after the introduction of ultrasonic vibration, the surface roughness degree and residual stress of the forming parts are remarkably improved, the microstructural refinement is obtained, and the tensile strength and yield strength are both increased. When the ultrasonic power is 44 W and the ultrasonic frequency is 17 kHz, compared with those of the parts without experiencing ultrasonic vibration, the residual stresses along x direction and y direction respectively decrease by 47.8% and 61.6%, the yield strength, tensile strength and area reduction increase by 6.1%, 2.7% and 10.6%, and the elongation slightly decreases to 29.2%.