Abstract:  To achieve efficient and stable additive manufacturing of dissimilar material parts， the dissimilar auxiliary wire feed gas metal arc-based additive manufacturing method was proposed. The H08Mn2Si mild steel wire and the H06MnNi3CrMoA high-tensile steel wire were fed into the molten pool simultaneously. The tests were carried out to adjust the components， microstructures， and properties of the deposited metals. The results show that the quantity of granular bainite and acicular ferrite in the deposited metals increases with the mass fraction of high-tensile steels， which improves the tensile strength and microhardness of the deposited metals. The ranges of tensile strength and microhardness are as 558~885 MPa and 197HV~390HV， respectively. Finally， the induction teeth structure of low carbon steel/high strength steel was fabricated by the proposed method. The hardness gradient was realized between the two materials through the component gradient transition， which mitigates the interface mismatch problems. 

Key words: auxiliary wire, gas metal arc-based additive manufacturing, dissimilar double wire, property adjustment

摘要： 为了实现高效、稳定的金属异质材料零件的增材制造，提出了异质辅助填丝熔化极电弧增材制造方法。向熔池中同时输送H08Mn2Si低碳钢焊丝与 H06MnNi3CrMoA 高强钢焊丝，开展了熔敷金属成分、组织、性能调节试验。结果表明，随着高强钢质量分数增大，熔敷金属组织中粒状贝氏体和针状铁素体的数量增加，提高了熔敷金属的抗拉强度与显微硬度，抗拉强度与显微硬度的调节范围分别为558～885 MPa和197HV～390HV。最后应用该方法成形了低碳钢/高强钢异质材料履带诱导齿模拟件，在两种材料之间通过成分梯度过渡连接，实现了硬度渐变，有效缓和了界面失配现象。

关键词: 辅助填丝, 熔化极电弧增材制造, 异质双丝, 性能调节