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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 was introduced into the laser metal forming IN718 to measure the surface roughness, residual stress and mechanical properties at room temperature. The microstructure of the formed part was analyzed. The results show that the surface roughness and residual stress of the formed part are significantly improved after the ultrasonic vibration is applied, the microstructure is refined, and both the tensile strength and the yield strength are improved. When the ultrasonic frequency is 17 kHz and the ultrasonic power is 44 W, the residual stress of the shaped part under the ultrasonic vibration is reduced by 47.8% and 61.6% respectively in both the x and y directions compared with that when no ultrasonic vibration is applied. The yield strength , The tensile strength and the elongation of the section increased by 6.1%, 2.7% and 10.6% respectively, and the elongation decreased to 29.2%.