脉冲频率对电弧增材制造6061铝合金沉积层形貌及组织与性能的影响  

Effect of pulse frequency on the morphology,microstructure and properties of deposited layer in arc additive manufacturing of 6061 aluminum alloy

作　　者：谭晨宇 周祥曼 罗彬 吕奇钊 TAN Chenyu;ZHOU Xiangman;LUO Bin;LYU Qizhao(College of Mechanical and Power Engineering,China Three Gorges University,Yichang 443002,Hubei,China)

机构地区：[1]三峡大学机械与动力学院,湖北宜昌443002

出　　处：《焊接》2025年第4期43-49,共7页Welding & Joining

摘　　要：【目的】旨在为电弧增材制造6061铝合金工艺参数选择提供参考依据。【方法】搭建了非熔化极惰性气保护焊(Tungsten inert gas, TIG)电弧增材制造平台,研究了不同脉冲频率对6061铝合金沉积层形貌、微观组织和力学性能的影响规律。【结果】结果表明,随着脉冲频率的提升,单层焊道鱼鳞纹逐渐变得细密,且单层焊道熔宽呈现先减小后增大的趋势,熔高呈现先增加后降低的变化规律;单层多道沉积试样晶粒平均尺寸在一定范围内先减小后增大,其断后伸长率持续增加,而抗拉强度和屈服强度则呈现先增后减的趋势。【结论】当峰值电流为170 A,脉冲频率为2.5 Hz时,试样的力学性能达到最佳水平,其抗拉强度达到166.6 MPa,屈服强度为129.2 MPa,平均硬度为61.3 HV。[Objective]The aim is to provide a reference for the selection of process parameters of 6061 aluminum alloy arc additive manufacturing.[Methods]A tungsten inert gas(TIG)arc additive manufacturing platform is constructed.The research focuses on the impact of different pulse frequencies mode on morphology,microstructure and mechanical properties of 6061 aluminum alloy deposited layers.[Results]The result of research shows that with the increase of pulse frequency,the fish-scale pattern of the single-layer weld gradually becomes denser,the fusion width of the single-layer weld shows a change rule of decreasing first and then increasing,the fusion height shows a change rule of increasing first and then decreasing.The average grain size of the single-layer multi-track deposition sample decreases and then increases within a certain range,its elongation after fracture continues to increase,the tensile strength and yield strength show a trend of increasing first and then decreasing.[Conclusion]When the peak current is 170 A and the pulse frequency is 2.5 Hz,the mechanical properties of the samples reach their optimal levels.The tensile strength reaches 166.6 MPa,the yield strength is 129.2 MPa and the average hardness is 61.3 HV.

关 键 词：电弧增材制造 脉冲频率 6061铝合金 微观组织 力学性能 

分 类 号：TG444[金属学及工艺—焊接]