Multi-wire and multi-arc additive technology has higher molding efficiency. But large heat input will affect the morphology and performance, so the superaudio arc is introduced to refine the grain and improve the penetration depth. In this paper, 316L stainless steel was used as the test material and MIG welding process was adopted to independently build the superaudio triple-wire arc additive manufacturing platform. Based on the single-wire single-channel model, the experiments of triple-wire single-channel single-layer and triple-wire single-channel multi-layer additive process were conducted. The results show that 30 kHz superaudio arc can significantly refine the microstructure of the weld and destroy the dendritic structure, increase the average transverse and horizontal tensile strength by 81 MPa and 23 MPa respectively, increase the average horizontal fracture elongation from 18.5% to 39.3%, and improve the microhardness of the test piece as a whole. But if the frequency is too high, the energy brought by the ultrasonic wave will be too high to slow down the cooling rate, resulting in grain coarsening.
关键词
电弧增材制造超音频多丝多弧微观组织力学性能
Keywords
wire arc additive manufacturingsuperaudiomulti-wire and multi-arcmicrostructuremechanical properties
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